Discuss the shape of following molecules using the VSEPR model. `BeCl_(2), BCl_(3), SiCl_(4), AsF_(5), H_(2)S, PH_3`.

Explanation

(i) Shape of `BeCl_(2) : BeCl_(2)` molecule has linear geometry with bond angle of `180^@` as shown below.

(ii) Shape of `BCl_3` : `BCl_3` molecule has trigonal planar in shape with regular geometry with bond angle of `120^@`.

(iii) Shape of `SiCl_4` : `SiCl_4` molecule is tetrahedral in shape with regular geometry having bond angle of `109.5^@`.

(iv) Shape of `AsF_(5) : AsF_(5)` has trigonal bipyramidal structure having bond angle of `90^(@)" and "120^(@)`

(v) Shape of `H_(2)S` : In `H_(2)S`, S has six electrons in the valence shell. Out of these six electrons, it shows two electrons with two H atoms forming two bond pairs while other 4 electrons remain as two lone pairs on sulphur atom, giving a bent shape to the molecule.

(vi) Shape of `PH_3` : In `Ph_3` the central atom P contain 5 valence electrons. Out of these 5 electrons it shares 3 electrons with H atoms forming 3 bond pairs while two remains as lone pair on P atom giving a trigonal pyramidal shape to the molecule.