Describe the geometry (shape) of some simple molecules or ions with central atoms having one or more lone pairs of electrons $(E)$.
(N/A) The geometry of molecules with central atom $A$,bonded atoms $B$,and lone pairs $E$ is summarized in the table below:
| Molecule type | No. of bonding pairs | No. of lone pairs | Arrangement of electron pairs | Shape | Example |
|---|---|---|---|---|---|
| $AB_2E$ | $2$ | $1$ | Trigonal planar | Bent | $SO_2, O_3$ |
| $AB_3E$ | $3$ | $1$ | Tetrahedral | Trigonal pyramidal | $NH_3$ |
| $AB_2E_2$ | $2$ | $2$ | Tetrahedral | Bent | $H_2O$ |
| $AB_4E$ | $4$ | $1$ | Trigonal bipyramidal | See-saw | $SF_4$ |
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Which of the following compounds has the smallest bond angle $(X-A-X)$ in each series respectively?
$A$. $OSF_2, OSCl_2, OSBr_2$ $B$. $SbCl_3, SbBr_3, SbI_3$ $C$. $PI_3, AsI_3, SbI_3$
| $A$. $OSF_2, OSCl_2, OSBr_2$ |
| $B$. $SbCl_3, SbBr_3, SbI_3$ |
| $C$. $PI_3, AsI_3, SbI_3$ |
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