Polyatomic Ions + Electronegativites

Hydrogen Phosphate

HPO₄^2-

Phosphate

PO₄^3-

Disulfide

S₂^2-

Peroxide

O₂^2-

Hydroxide

OH^-

Nitrate

NO₃^-

Nitrite

NO₂^-

Ammonium

NH₄⁺

Azide

N₃^-

Permanganate

MnO₄^-

Dichromate

Cr₂O₇^2-

Chromate

CrO₄^2-

Perchlorate (oxoanion)

ClO₄^-

^{Chlorate (oxoanion)}

ClO₃^-

Chlorite (oxoanion)

ClO₂^-

Acetate

CH₃COO^-

Dihydrogen phosphate

H₂PO₄^-

Carbonate

CO₃^2-

Hydrogen carbonate/ Bicarbonate

HCO₃^-

Hypochlorite (oxoanion)

ClO^-

Cyanide

CN^-

Thiocyanate

SCN^-

Hydrogen sulfate/ Bisulfate

HSO₄^-

Hydrogen sulfite/ Bisulfite

HSO₃^-

Sulfate

SO₄^2-

Sulfite

SO₃^2-

H

2.1

C

2.5

N

3.0

O

3.5

F

4.0

P

2.1

S

2.5

Cl

3.0

Se

2.4

Br

2.8

I

2.5

Linear

2 e- domains. 180 degrees

Trigonal planar

3 e- domains. 120 degrees

Bent

3 e- domains but 2 bonded and 1 unbonded. Less than 120 degrees.

OR

4 e- domains but 2 bonded and 2 unbonded. Less than 109.5 degrees

Tetrahedral

4 e- domains. 109.5 degrees

Trigonal Pyramidal

4 e- domains but 3 bonded and 1 unbonded. Less than 109.5 degrees.

Octahedral

6 e- domains. 90 degrees.

Square Pyramidal

6 e- domains but 5 bonded and 1 unbonded. Less than 90 degrees.

Square Planar

6 e- domains but 4 bonded and 2 unbonded. Less than 90 degrees.