Solutions
- Page ID
- 90882
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\(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)For each molecule on the worksheet, the Lewis Dot Structure, the number of valence electrons, the electron arrangement (E.A.) and the molecular geometry (M.G.) are given, respectively. To see a larger view of the Lewis Dot Structure, point at the molecule, right click on the mouse and go to 'View image'.
Lewis Dot works best for covalent compounds of group A elements, though Lewis Dot Structures can explain electron transfer in ionic compounds. By following the rules below, the Lewis Dot Structure can be written for covalent compounds and some polyatomic ions.
- Count the total number of valence electrons, adjust for charge if an ion. Add one electron for each negative charge, subtract one electron for each positive charge.
- Place a pair of electrons between the central atom (usually written first) and each of the outer atoms.
- Complete the octet of the outer atoms (except H, which needs only 2 electrons).
- Place extra electrons, if any, on the central atom in pairs.
- If the central atom does not have a complete octet, share extra electrons from the outer atoms until the central atom and the outer atoms have a complete octet. Note: halides do not form double bonds.
PF5 | 40 electrons tbp tbp | CS2 | 16 electrons linear linear | BrO3- | 26 electrons Td trigonal pyr. |
NH4+ | 8 electrons Td Td | SCl4 | 34 electrons tbp see-saw | BrF5 | 42 electrons Oh square pyr. |
BF3 | 24 electrons trigonal planar trigonal planar | SCl6 | 48 electrons Oh Oh | PH3 | 8 electrons Td trigonal pyr. |
NF3 | 26 electrons Td trigonal pyr. | SO42- | 32 electrons Td Td | CO32- | 24 electrons trigonal planar trigonal planar |
SiCl4 | 32 electrons Td Td | ClO3- | 26 electrons Td trigonal pyr. | CH2O | 12 electrons trigonal planar trigonal planar |
NO3- | 24 electrons trigonal planar trigonal planar | O3 | 18 electrons trigonal planar bent | CCl4 | 32 electrons Td Td |
AlH3 | 6 electrons trigonal planar trigonal planar | SO2 | 18 electrons trigonal planar bent | SO3 | 24 electrons trigonal planar trigonal planar |
CO | 10 electrons linear linear | CHCl3 | 26 electrons Td Td | BrF3 | 28 electrons tbp T-shaped |
H2S | 8 electrons Td bent | I3- | 22 electrons tbp linear | H3O+ | 8 electrons Td trigonal pyr. |