Ibr4 Molecular Geometry

Ibr4 Molecular GeometryThe electron geometry for the Iodi. Step 1: Find the total number of valence electrons IBr4– lewis structure has a total 36 valence electrons. Solved Determine the molecular geometry of IBr4−IBr4− | Chegg. com/_ylt=AwrhdvT3Jl9kkdYRI05XNyoA;_ylu=Y29sbwNiZjEEcG9zAzIEdnRpZAMEc2VjA3Ny/RV=2/RE=1683986295/RO=10/RU=https%3a%2f%2fknordslearning. It is square planar with respect to the 4 I-Br bonds, there are 2 lone pairs in the structure, one above and one below the plane of the I-Br bonds, (above and below. It includes the general shape of the molecule as well as bond lengths, bond angles, torsional anglesand any other geometrical parameters. 500 W, how much energy is in each pulse? (b) If the wavelength of the laser light is 643 run, how many photons are present in each pulse? Verified answer. An explanation of the molecular geometry for the IBr3 (Iodine tribromide) including a description of the IBr3 bond angles. then the molecular geometry of DF4(g) is square. This molecule’s chemical formula is OF2 as it contains one atom of Oxygen and two atoms of Fluorine. Draw Lewis structure for these molecules: PCl3 ICl3 NO2 IF5 XeF2 IBr4- SF6 b. An explanation of the molecular geometry for the CBr4 (Carbon tetrabromide) including a description of the CBr4 bond angles. What is the molecular geometry of IBr4-? Wiki User ∙ 2013-01-28 02:58:45 Study now See answer (1) Best Answer Copy Square Planar, Like XeF4 Wiki User ∙ 2013. Predict the geometry and polarity of the CS2 molecule. Determine the shape of CH_4 molecule based on the valence shell electron pair repulsion theory. Three of the following molecular models have a tetrahedral central atom, and one does not. Dipole: It depicts the shift in the charge between two bonded atoms which eventually decides whether the molecule will. The Iodine atom has 2 lone pairs and it also has -1 formal charge. be/HpGDb0zQ6ts Channel: The Organic Chemistry Tutor Measure skills from any curriculum Tag the questions with any skills you have. FlexBook Platform®, FlexBook®, FlexLet® and FlexCard™ are registered trademarks of CK-12 Foundation. IBr 4– has one iodine atom and four bromine atoms. Want to see the full answer? Check out a sample Q&A here. 10K views 4 years ago A step-by-step explanation of how to draw the IBr4 - Lewis Dot Structure. Solved Determine the molecular geometry of IBr4−IBr4− | Chegg. The ion has a negative charge as it accepts one valence electron. Iodine and bromine make up the two different halogen atoms that make up the inter-halogen compound IBr4-. molecular geometry IBr−4 and make a ">Solved Determine the molecular geometry IBr−4 and make a. There are a total of 21 valence electrons in Brf2 Lewis structure in which the central atom bromine (Br) has 9 electrons in its outer shell ie 4 electrons from the bonds formed with 2 fluorine atoms and 5 non bonded (2 lone pairs and one unpaired) electrons. An explanation of the molecular geometry for the IBr3 (Iodine tribromide) including a description of the IBr3 bond angles. Transcribed Image Text: 4 Draw the Lewis structure for IBR4 and use it to answer the following questions: ut of a) Predict the molecular shape of IBR4: b) Predict the hybridization of the central atom: s page Next page pur Pledge, Midterm Periodic Table - printable Jump to 3 pdf Expert Solution Want to see the full answer?. Valence Shelf Electron Pair Repulsion (VSEPR) Theory 3) Give the number of "electron domains" around the central bonding atom. Transcribed Image Text: 4 Draw the Lewis structure for IBR4 and use it to answer the following questions: ut of a) Predict the molecular shape of IBR4: b) Predict the hybridization of the central atom: s page Next page pur Pledge, Midterm Periodic Table - printable Jump to 3 pdf Expert Solution Want to see the full answer?. Carbon tetrabromide) Molecular Geometry, Bond Angles">CBr4 (Carbon tetrabromide) Molecular Geometry, Bond Angles. IBr4 has square planar geometry and its hybridization is sp3d2. The central Iodine atom of the IBr4-Lewis structure, which has a. How to Draw the Lewis Dot Structure for IBr4. The ion is made up of three atoms: Sulphur, Carbon and Nitrogen. See Answer Question: What is the molecular geometry for the ion, BrF4+ ?. Determine the electron geometry (eg) and molecular geometry (mg) of IBr 4-. This is composed of a s framework and a π-bond. Draw all major and minor resonance structures, if any. Solved Question1: Give the approximate bond angle. linear This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Ch 10: VSEPR Practice problems Flashcards. Write they valence electrons e. Recently I came across a question asking for the geometry of the aforementioned molecule. 4, 4, 0 For this molecular geometry give the number of total electron groups, number of bonding groups, and number of lone pairs on the central atom. A step-by-step explanation of how to draw the BrF4+ Lewis Dot Structure. Determine the molecular geometry IBr−4 and make a sketch. 4) Give the electron domain geometry (sometimes called the orbital geometry. Linear Determine the molecular geometry and make a sketch of the molecule or ion using the bond conventions in Section 10. Explanation : Now we have to determine the hybridization of the given molecule. The molecules CCl 4 and PCl 3 have the same electron-domain. Start from the Lewis structure of the tetrafluoroborate ion, BrF − 4. The molecular shape is predicted to be trigonal planar around each carbon atom. Chemistry Chemistry questions and answers Determine the molecular geometry of IBr4−IBr4− using the bond conventions shown in the "Representing Molecular Geometries on Paper" section of this chapter (see Section 5. Determine the shape of I Br− 4 I B r 4 − and then decide if it has a dipole. (a) Determine the electron-domain geometry of CCl 4 and PCl 3. Indicate the molecular geometry 1. The molecular shape is predicted to be trigonal planar around each carbon atom. com%2flewis-structure-of-ibr4%2f/RK=2/RS=vcnh19VCcXoV1wSeKqsCiuE1j_0-" referrerpolicy="origin" target="_blank">See full list on knordslearning. SeF4 Question For each of the following, a. IBr4- Expert Solution Want to see the full answer? Check out a sample Q&A here See Solution star_border. Brf2 Lewis Structure, Characteristics:13 Must To Know Facts. Let’s draw and understand this lewis dot structure step by step. The molecular geometry of a molecule refers to how its constituent atoms are arranged in 3D space. Determine the molecular geometry IBr−4 and make a sketch This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Draw the Lewis structure for IBr4 and use it to answer the following questions: a) Predict the molecular shape of IBr4*: b) Predict the hybridization of the central atom: Question. The answer is A) square planar. It also tells you whether or not if IBr4- is polar or nonpolar. 10K views 4 years ago A step-by-step explanation of how to draw the IBr4 - Lewis Dot Structure. BF4 Use the matching numbers below to indicate the molecule Hybridization Electron-domain geometry. 5, 3, 2 For this molecular geometry give the number of total electron groups, number of bonding groups, and number of lone pairs on the central atom. Determine the molecular geometry IBr−4 and make a sketch This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. See Answer Question: Determine the molecular geometry IBr−4 and make a sketch Determine the molecular geometry IBr−4 and make a sketch Expert Answer. NaF RbBr KCl KCl > NaF > RbBr RbBr > NaF > KCl NaF > RbBr > KCl RbBr > KCl > NaF NaF > KCl > RbBr, Which molecule or compound below contains an ionic bond?, Place the following elements in order of increasing electronegativity. A: Molecular geometry or molecular structure is the three dimensional arrangement of atoms in a. It also tells you whether or not if IBr4- is polar or nonpolar. K Cs P K < P < Cs Cs < P < K P. molecular geometry IBr−4 and make a sketch">Determine the molecular geometry IBr−4 and make a sketch. (a) If the pulses last for 20. Find Your Textbook Study Groups. Determine the electron geometry (eg) and molecular geometry (mg) of IBr 4-. Lewis Structure For IBr4- , Molecular Geometry, Bond Angle, Hybridization, Polar or Nonpolar. A: a) SCl2 = The given molecule is Polar. What is the molecular geometry for the ion, BrF4+ ? A. It is sparingly soluble in ether and benzene. For more complicated molecules the geometry at each atom may have to be determined in order to get an dea of the overall shape. Each bromine atom has three three lone pairs, and the iodine atom has two lone pairs. Determine the molecular geometry of IBr4−IBr4− using the bond conventions shown in the “Representing Molecular Geometries on Paper” section of this chapter (see Section 5. molecular geometry of IBr4. The molecule will have a total of 36 valence electrons - 7 from bromine, 7 from each of the four fluorine atoms, and one extra electron to give the ion the -1 charge. Indicate the molecular geometry c. The molecules CCl 4 and PCl 3 have the same electron-domain geometry but different molecular geometries and bond angles. OneClass: a. CBr4 (Carbon tetrabromide) Molecular Geometry, Bond Angles Wayne Breslyn 635K subscribers Subscribe 9. Transcribed Image Text: 4 Draw the Lewis structure for IBR4 and use it to answer the following questions: ut of a) Predict the molecular shape of IBR4: b) Predict the. The I n C l X 5 X 2 − ion does not have C 4 v symmetry, and VSEPR theory pretty much explains formation of numerous slightly distorted trigonal bipyramidal I n C l X 5 X 2 − -containing complexes according to the most recent single-crystal structure experiments. It is square planar with respect to the 4 I-Br bonds, there are 2 lone pairs in the structure, one above and one below the plane of the I-Br bonds, (above and below the nitrogen). Determine the shape of I Br− 4 I B r 4 − and then decide if it has a dipole. Molecular Geometry of IF₄⁺. For finding out the molecular geometry and hybridization of the molecule, it is vital first to know the Lewis Structure of OF2. Let us study IBr 4– lewis structure in detail. IBr 4– lewis structure contains central Iodine atom which is covalently bonded to four Bromine atom and has -1 formal charge. The figure that follows contains ball-and-stick drawings of three possible shapes of an AF4 molecule. The I n C l X 5 X 2 − ion does not have C 4 v symmetry, and VSEPR theory pretty much explains formation of numerous slightly distorted trigonal bipyramidal I n C l X 5 X 2 − -containing complexes according to the most recent single-crystal structure experiments. Determine the molecular geometry and make a sketch of the molecule or ion using the bond conventions in Section 10. Draw Lewis structure for these molecules: b. Draw the bond dipole of the O-F bond. SOLVED:Determine the molecular geometry and draw each. For the IBr4 - structure use the periodic table to find the total number of valence electro Super. In other words, the geometry around the iodine atom (taking into account the lone pairs and the I-Br bonds) is octahedral. Molecular Geometry: The geometry of a covalent molecule is determined by the hybridization of the central atom and the count of lone pair electrons present, as per the VSEPR theory. In other words, the geometry around the iodine atom (taking into account the lone pairs and the I-Br bonds) is octahedral. What is the molecular geometry of ibr4? octahedral So, the electron geometry is octahedral. Under what circumstances are electron geometry and molecular geometry not the same? Under what circumstances are they not the same? -Electron geometry is the arrangement of the electron groups. Expert Answer. Solved What is the molecular geometry for the ion, BrF4. So, iodine should be placed in the center and the remaining 4 bromine atoms will surround it. Solved step-by-step Which statement about IBr4 are TRUE? The molecular geometry (or shape) is tetrahedral: The electron geometry around the central atom is trigonal bipyramidal Has 3 net dipole moment: The hybridization about the central atom is 'sp?. Best Match Question: What is the molecular geometry of IBr4⁻? Discussion. 4) Give the electron domain geometry (sometimes called the orbital geometry. But the molecular geometry (you only take. The Iodine atom (I) is at the center and it is surrounded by 4 Bromine atoms (Br). What is the molecular geometry of I Br− 4 I B r 4 −? Molecular Geometry: The geometry of a covalent molecule is determined by the hybridization of the central atom and the count of lone. What is the molecular geometry of IBr4⁻? Video Answer: Solved by verified expert. IBr4 Chemistry: Structure and Properties Nivaldo Tro 2 Edition Chapter 5, Problem 61 Question Answered step-by-step Determine the molecular geometry and draw each molecule or ion using the bond conventions shown in the "Representing Molecular Geometries on Paper" section of this chapter (see Section 5. The polarity of the molecule can be determined on the basis. 4K views 2 years ago An explanation of the molecular geometry for the CBr4. 4: [IBr4]- Square planar Determine the molecular geometry and make a sketch of the. Molecular geometryis the three-dimensionalarrangement of the atomsthat constitute a molecule. Determine the molecular geometry IBr−4 and make a sketch. See Answer Question: Determine the molecular geometry and make a sketch of each molecule or ion: a. Determine the molecular geometry of IBr4−IBr4−. Linear Determine the molecular geometry and make a sketch of the molecule or ion using the bond conventions in Section 10. 0 ms and if the output power of the laser is 0. An explanation of the molecular geometry for the IBr3 (Iodine tribromide) including a description of the IBr3 bond angles. CBr4 (Carbon tetrabromide) Molecular Geometry, Bond Angles. IBr4- 152 Question 39c Textbook Question Determine the molecular geometry and sketch each molecule or ion using the bond conventions shown in “Representing Molecular Geometries on Paper” in Section 10. FlexBook Platform®, FlexBook®, FlexLet® and FlexCard™ are registered trademarks of CK-12 Foundation. Indicate the molecular geometry. A step-by-step explanation of how to draw the BrF4+ Lewis Dot Structure. Group of answer choices eg = trigonal bipyramidal, mg = linear eg = tetrahedral, mg = trigonal pyramidal eg = trigonal planar, mg = bent eg = tetrahedral, mg = tetrahedral eg = octahedral, mg = square planar QUESTION 3 Draw the Lewis structure for H 3 O +. The electron geometry for the Ca. But the molecular geometry (you only take. CBr4 (Carbon tetrabromide) Molecular Geometry, Bond Angles Wayne Breslyn 635K subscribers Subscribe 9. IBr4- Question Determine the molecular geometry and sketch each molecule or ion using the bond conventions shown in “Representing Molecular Geometries on Paper” in Section 10. Draw the bond dipole of the H-Te bond. IBr3 (Iodine tribromide) Molecular Geometry, Bond Angles (and …. Here in the IBr4 molecule, if we compare the iodine atom (I) and bromine atom (Br), then iodine is less electronegative than bromine. SeF4 For each of the following, a. Determine the electron geometry (eg) and molecular geometry (mg) of IBr 4-. Solved step-by-step Which statement about IBr4 are TRUE? The molecular geometry (or shape) is tetrahedral: The electron geometry around the central atom is trigonal bipyramidal Has 3 net dipole moment: The hybridization about the central atom is 'sp?. Do they have Resonance Structures? d. predic shape and hybridization. What is the molecular geometry of IBr4. Also, there is a negative (-1) charge on the iodine atom. (a) For each shape, give the electron-domain geometry on which the. 10K views 4 years ago A step-by-step explanation of how to draw the IBr4 - Lewis Dot Structure. Chemistry questions and answers. You must be signed in to discuss. ) 5) Give the molecular geometry. H30 IBr4 HCN Molecular Geometry: Molecular Geometry: M Molecular Geometry: Molecular Geometry IF3 IF4 IFs IF202 Molecular Geometry: Molecular Geometry: Molecular Geometry: Molecular Geometry: IOFs NCl3 NF2 NO2 Molecular Geometry: Molecular Geometry: Molecular Geometry: Molecular Geometry This problem has been solved!. A surgeon is attempting to correct a detached retina by using a pulsed laser. What is the molecular geometry of IBr4⁻? This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Draw the Lewis Dot structure for IBr4-. Draw a 3-D Chemistry 1 answer 0 watching 437 views orangeclam897 Lv1 28 Nov 2020 a. The five main shapes of molecules are line, trigonal planar, tetrahedral, trigonal bipyramidal,. molecular geometry of BrF4. Science Chemistry Indicate the molecular geometry 1. CBr4 (Carbon tetrabromide) Molecular Geometry, Bond Angles Wayne Breslyn 635K subscribers Subscribe 9. According to Brown et al. What is the molecular geometry of IBr4-? Wiki User ∙ 2013-01-28 02:58:45 Study now See answer (1) Best Answer Copy Square Planar, Like XeF4 Wiki User ∙ 2013-01-28 02:58:45 This answer is:. ) 5) Give the molecular geometry. This molecule’s chemical formula is OF2 as it contains one atom of Oxygen and two atoms of Fluorine. The molecules CCl 4 and PCl 3 have the same electron-domain geometry but different molecular geometries and bond angles. What is the molecular geometry of IBr4⁻? This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Solved Question1: Give the approximate bond angle between. Study with Quizlet and memorize flashcards containing terms like Place the following in order of decreasing magnitude of lattice energy. For the IBr4 - structure use the periodic table to find the total number of valence electro. The approximate bond angles are 109. What is the molecular geometry of IBr4⁻?. Determine the molecular geometry IBr−4 and make a sketch This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Solved Determine the molecular geometry of IBr4−IBr4−. The ion is the conjugate base of thiocyanic acid ( HSCN). This video shows you how to draw the lewis structure for IBr4-. Lewis structure of IBr4- ion contains four single bonds between the Iodine (I) atom and each Bromine (Br) atom. IBr 4– lewis structure contains central Iodine atom which is covalently bonded to four Bromine atom and has -1 formal charge. SOLVED: Which statement about IBr4 are TRUE? The molecular. IBr3 (Iodine tribromide) Molecular Geometry, Bond Angles (and. Solved Determine the molecular geometry of IBr4−IBr4− | Chegg. Did you know? Numerade has step-by-step video solutions, matched directly to more than +2,000 textbooks. 4, 4, 0 For this molecular geometry give the number of total electron groups, number of bonding groups, and number of lone pairs on the central atom. In IBr 4– lewis structure, there are four single bonds around the iodine atom, with four bromine atoms attached to it. The electron geometry for the Iodine tribromide is also provided. What is the molecular geometry of BrF4. Answered: Draw the Lewis structure for IBr4 and…. Transcribed Image Text: 4 Draw the Lewis structure for IBR4 and use it to answer the following questions: ut of a) Predict the molecular shape of IBR4: b) Predict the hybridization of the central atom: s page Next page pur Pledge, Midterm Periodic Table - printable Jump to 3 pdf Expert Solution Want to see the full answer?. Lewis Structure For IBr4- , Molecular Geometry, Bond Angle, Hybridization, Polar or Nonpolar. IBr4−1 This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Determine the molecular geometry of each molecule. Solved H30 IBr4 HCN Molecular Geometry: Molecular. Answered: For each of the following, a. Lewis Structure For IBr4- , Molecular Geometry, Bond Angle, Hybridization, Polar or Nonpolar Youtube resource by Zzish User Video unavailable This video is unavailable https://youtu. The video also talks about the molecular geometry, bond angle, and hybridization for IBr4-. , 1 the crystal structure of [NEtX4]X2[InClX5] reveals that the pentachloridoindate (III) anion, [InClX5]X2 −, adopts a square pyramidal C4v geometry (VSEPR theory would predict trigonal bipyramidal D3h ): According to Greenwood and Earnshaw, 2. If these are all bond pairs the molecular geometry is tetrahedral (e. It is square planar with respect to the 4 I-Br bonds, there are 2 lone pairs in the structure, one above and one below the plane of the I-Br bonds, (above and below the nitrogen). The ion is the conjugate base of thiocyanic acid ( HSCN). There are common derivatives for the compound, which include potassium thiocyanate and sodium thiocyanate. Drawing and predicting the IBr3 molecular geometry is very easy by following the given method. This video shows you how to draw the lewis structure for IBr4-. Determine the correct molecular geometry (from left to right ">Determine the correct molecular geometry (from left to right. Step #3: Put two electrons between the atoms to represent a chemical bond. If there is one lone pair of electrons and three bond pairs the. A surgeon is attempting to correct a detached retina by using a pulsed laser. Determine the molecular geometry and sketch each molecule or …. Calculate the total number of valence electrons. SOLVED: Which statement about IBr4 are TRUE? The molecular geometry …. IBr4- is an inter-halogen compounds which composed of two different halogen atoms namely Iodine and Bromine. 4K views 2 years ago An explanation of the molecular geometry for the CBr4 (Carbon. Mastering Chemistry Tro Chapter 10 Flashcards. 6) Give the expected bond angles. For the BrF4+ structure use the periodic table to find the total number of valence electr covalent problem C2H2F2 DrPChem. The video also talks about the molecular geometry, bond angle, and hybridization for IBr4-. FlexBook Platform®, FlexBook®, FlexLet® and FlexCard™ are registered trademarks of CK-12 Foundation. Determine the molecular geometry and make a sketch of the molecule or ion using the bond conventions in Section 10. Identify the electron cloud geometry, molecular geometry, the bond angles, and hybridization. Question: Identify the s framework and the π-bonds in acetylene, C2H2, H-C≡C-H. It’s easy to understand the Lewis structure of this molecule as it has only two types of atoms in the molecule. The bromine atom will be bonded to each of the four fluorine. Start from the Lewis structure of the tetrafluoroborate ion, BrF_4^(-). For example; four electron pairs are distributed in a tetrahedral shape. Answer : The molecular geometry of interior carbon atom is tetrahedral. Let us explore the hybridization, bond angle, lone pairs, valence electrons, polarity of IBr 4- in detail. Iodine monobromide | BrI | CID 82238 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety. IBr4- Question Determine the molecular geometry and sketch each molecule or ion using the bond conventions shown in “Representing Molecular Geometries on Paper” in Section 10. IBr4- lewis structure. Tellurium tetraiodide | TeI4 or I4Te | CID 82255 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological. The electron geometry for the Iodine tribromide is. 4: [IBr4]- Square planar Determine the molecular geometry and make a sketch of the molecule or ion using the bond conventions in Section 10. How to Draw the Lewis Dot Structure for BrF4+. The answer key claimed the shape as an irregular tetrahedron, but as per my knowledge, it should have been like a see-saw. IBr4 HCN Molecular Geometry: Molecular. See Answer Question: What is the molecular geometry of IBr4⁻? What is the molecular geometry of IBr 4 ⁻? Expert Answer The molecular … View the full answer. The molecular geometry of i b r for negative So molecular geometry your number three oh I pr more negative yes, bit shape. The video also talks about the molecular geometry, bond angle, and hybridization for IBr4-. Molecular Geometry: The geometry of a covalent molecule is determined by the hybridization of the central atom and the count of lone pair electrons present, as. 4K views 2 years ago An explanation of the molecular geometry for the. Molecular Geometry of IF₄⁺ Ask Question Asked 3 years ago Modified 3 years ago Viewed 189 times 2 Recently I came across a question asking for the. Determine the molecular geometry and make a sketch of the molecule or ion using the bond conventions in Section 10. Ch 10: VSEPR Theory Practice Problems Flashcards. Determine the molecular geometry of IBr4-IBr4- using the bond conventions shown in the “Representing Determine the molecular geometry of IBr4−IBr4− using the bond conventions shown in the “Representing Molecular Geometries on Paper” section of this chapter (see Section 5. molecular geometry and draw each ">SOLVED:Determine the molecular geometry and draw each. 100% (1 rating) Transcribed image text: H30 IBr4 HCN Molecular Geometry: Molecular Geometry: M Molecular Geometry: Molecular Geometry IF3 IF4 IFs IF202 Molecular Geometry: Molecular Geometry: Molecular Geometry: Molecular Geometry: IOFs NCl3 NF2 NO2 Molecular Geometry: Molecular Geometry: Molecular Geometry: Molecular Geometry. Lewis Structure For IBr4- , Molecular Geometry, Bond Angle, Hybridization, Polar or Nonpolar Youtube resource by Zzish User Video unavailable This video is unavailable https://youtu. Tellurium tetraiodide | TeI4 or I4Te | CID 82255 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological. The molecular geometry of i b r for negative So molecular geometry your number three oh I pr more negative yes, bit shape as red plane. Formula used : where, V = number of valence electrons present in central atom N = number of monovalent atoms bonded to central atom C = charge of cation A = charge of anion The given molecule is,. IBr4 has square planar geometry and its hybridization is sp3d2. For the BrF4+ structure use the periodic table to find the total number of valence electr covalent problem.