Common Polyatomic Ions (Symbols First)

Question 1

NH₄⁺

Answer 1

ammonium ion

Question 2

CO₃^2-

Answer 2

carbonate ion

Question 3

CN^-

Answer 3

cyanide ion

(Note that the suffix -ide is an exception to the general -ate and -ite rule.

Question 4

HCO₃^-

Answer 4

hydrogen carbonate ion

Question 5

HSO₄^-

Answer 5

hydrogen sulfate ion

Question 6

OH^-

Answer 6

hydroxide ion

Question 7

NO₃^-

Answer 7

nitrate ion

Question 8

NO₂^-

Answer 8

nitrite ion

Question 9

PO₄^3-

Answer 9

phosphate ion

Question 10

SO₄^2-

Answer 10

sulfate ion

Question 11

SO₃^2-

Answer 11

sulfite ion