Polyatomic Ions + Molecule/Electron Geometries

Acetate

CH3COO^-

Carbonate

CO32-

Bicarbonate

HCO3-

Nitrate

NO3-

Nitrite

NO2-

Sulphate

SO42-

Sulphite

SO32-

Phosphate

PO43-

Cyanide

CN-

Chromate

CrO42-

Dichromate

Cr2O72-

Permanganate

MnO4-

Perchlorate

ClO4-

Perbromate

BrO4-

Periodate

IO4-

Chlorate

ClO3-

Bromate

BrO3-

Iodate

IO3-

Chlorite

ClO2-

Bromite

BrO2-

Iodite

IO2-

Hypochlorite

ClO-

Hypobromite

BrO-

Hypoiodite

IO-

Ammonium

NH4+

Hydroxide

OH-

Hydronium

H3O+

Linear

2 electron domains

2 bonds

0 Lone Pairs

Trigonal Planar

3 Electron Domains

3 Bonds

0 Lone pairs

Bent (Trigonal Planar)

3 Electron Domains

2 Bonds

1 Lone Pair

Tetrahedral

4 Electron Domains

4 Bonds

0 Lone Pairs

Trigonal Pyramidal

4 Electron Domains

3 Bonds

1 Lone Pair

Bent (Tetrahedral)

4 Electron Domains

2 Bonds

2 Lone Pairs

Trigonal Bipyramidal 

5 Electron Domains

5 Bonds

0 Lone Pairs

See Saw

5 Electron Domains

4 Bonds

1 Lone Pair

T-Shape (Trigonal Bypyramidal)

5 Electron Domains

3 Bonds

2 Lone Pairs

Linear (Trigonal Bipyramidal)

5 Electrons Domain

2 Bonds

3 Lone Pairs

Octahedral

6 Electron Domains

6 Bonds

0 Lone Pairs

Square Pyramidal

6 Electron Domains

5 Bonds

1 Lone Pair

Square Planar

6 Electron Domains

4 Bonds

2 Lone Pairs

T Shape (Octahedral)

6 Electron Domains

3 Bonds

3 Lone Pairs

Linear (Octahedral)

6 Electron Domains

2 Bonds

4 Lone Pairs