IBCHEM - bond angles, electron domain & molecular geometry (VSEPR theory)

When are the molecular geometry & electron domain geometry the same shape?

When there are no lone pairs of electrons in the central atom, every extra lone pair decreases bond angle by approx. 2.5°

linear:

180°

trigonal planar:

120°

trigonal bipyramidal:

90° & 120°

tetrahedral:

109.5°

V-shaped/bent:

104.5° (when there are 2 lone pairs)

triangular bipyramidal:

90° & 120°

octahedral:

90° & 180°

EDG→ octahedral, MG→ square pyramidal:

<90° e.g BrF₅ (5 bonds, 1 lone pair)

octahedral, octahedral:

90° e.g SF₆ (6 bonds, 0 lone pairs)

trigonal bipyramidal, seesaw:

<90° & <120° e.g SF₄ (4 bonds, 1 lone pair)

trigonal bipyramidal, T-shaped:

<90° e.g CIF₃ (3 bonds, 2 lone pairs)

octahedral, square planar:

90° e.g XeF₄ (4 bonds, 2 lone pairs)