Common Polyatomic Ions (Mixed -CHM151)

Question 1

ammonium ion

Answer 1

NH₄⁺

Question 2

carbonate ion

Answer 2

CO₃^2-

Question 3

cyanide ion

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

Answer 3

CN^-

Question 4

hydrogen carbonate ion

Answer 4

HCO₃^-

Question 5

hydrogen sulfate ion

Answer 5

HSO₄^-

Question 6

hydroxide ion

Answer 6

OH^-

Question 7

nitrate ion

Answer 7

NO₃^-

Question 8

nitrite ion

Answer 8

NO₂^-

Question 9

phosphate ion

Answer 9

PO₄^3-

Question 10

sulfate ion

Answer 10

SO₄^2-

Question 11

sulfite ion

Answer 11

SO₃^2-

Question 12

Silicate

Answer 12

SiO₃^2-

Question 13

Arsenate Ion

Answer 13

AsO₄^3-

Question 14

Selenate

Answer 14

SeO₄^2-

Question 15

Chlorate

Answer 15

ClO₃^-

Question 16

Bromate

Answer 16

BrO₃^-

Question 17

Iodate

Answer 17

IO₃^-

Question 18

Selenite

Answer 18

SeO₃^2-

Question 18

Phosphite

Answer 18

PO₃^3-

Question 19

Arsenite

Answer 19

AsO₃^3-

Question 20

Iodite

Answer 20

IO₂^-

Question 21

Bromite

Answer 21

BrO₂^-

Question 22

Chlorite

Answer 22

ClO₂^-

Question 23

Perchlorate

Answer 23

ClO₄^-

Question 24

Hypochlorite

Answer 24

ClO^-

Question 25

Perbromate

Answer 25

BrO₄^-

Question 26

Hypobromite

Answer 26

BrO^-

Question 27

Periodate

Answer 27

IO₄^-

Question 28

Hypoiodite

Answer 28

IO^-

Question 29

Chromate

Answer 29

CrO₄^2-

Question 30

Dichromate

(indicates 2 chromium atoms)

Answer 30

Cr₂O₇^2-

Question 31

Permanganate

Answer 31

MnO₄^-

Question 32

Manganate

Answer 32

MnO₄^2-

Question 33

Acetate

Answer 33

C₂H₃O₂^-

Question 34

Hydrogen Phosphate

Answer 34

HPO₄^2-

Question 35

Cyanate

Answer 35

CNO^-

Question 36

Thiocyanate

Answer 36

SCN^-

Question 37

Hydrogen Phosphite

Answer 37

HPO₃^2-

Question 38

Dihydrogen Phosphite

Answer 38

H₂PO₃^-

Question 39

Hydrogen Sulfite

Answer 39

HSO₃^-

Question 40

Peroxide

Answer 40

O₂^2-

Question 41

Hydronium Ion

Answer 41

H₃O⁺

Question 42

NH₄⁺

Answer 42

ammonium ion

Question 43

CO₃^2-

Answer 43

carbonate ion

Question 44

CN^-

Answer 44

cyanide ion

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

Question 45

HCO₃^-

Answer 45

hydrogen carbonate ion

Question 46

HSO₄^-

Answer 46

hydrogen sulfate ion

Question 47

OH^-

Answer 47

hydroxide ion

Question 48

NO₃^-

Answer 48

nitrate ion

Question 49

NO₂^-

Answer 49

nitrite ion

Question 50

PO₄^3-

Answer 50

phosphate ion

Question 51

SO₄^2-

Answer 51

sulfate ion

Question 52

SO₃^2-

Answer 52

sulfite ion

Question 53

SiO₃^2-

Answer 53

Silicate

Question 54

AsO₄^3-

Answer 54

Arsenate Ion

Question 55

SeO₄^2-

Answer 55

Selenate

Question 56

ClO₃^-

Answer 56

Chlorate

Question 57

BrO₃^-

Answer 57

Bromate

Question 58

IO₃^-

Answer 58

Iodate

Question 59

SeO₃^2-

Answer 59

Selenite

Question 60

PO₃^3-

Answer 60

Phosphite

Question 61

AsO₃^3-

Answer 61

Arsenite

Question 62

IO₂^-

Answer 62

Iodite

Question 63

BrO₂^-

Answer 63

Bromite

Question 64

ClO₂^-

Answer 64

Chlorite

Question 65

Clo₄^-

Answer 65

Perchlorate

Question 66

ClO^-

Answer 66

Hypochlorite

Question 67

BrO₄^-

Answer 67

Perbromate

Question 68

BrO^-

Answer 68

Hypobromite

Question 69

IO₄^-

Answer 69

Periodate

Question 70

IO^-

Answer 70

Hypoiodite

Question 71

CrO₄^2-

Answer 71

Chromate

Question 72

Cr₂O₇^2-

Answer 72

Dichromate

(indicates 2 chromium atoms)

Question 73

MnO₄^-

Answer 73

Permanganate

Question 74

MnO₄^2-

Answer 74

Manganate

Question 75

C₂H₃O₂^-

Answer 75

Acetate

Question 76

HPO₄^2-

Answer 76

Hydrogen Phosphate

Question 77

CNO^-

Answer 77

Cyanate

Question 78

SCN^-

Answer 78

Thiocyanate

Question 79

HPO₃^2-

Answer 79

Hydrogen Phosphite

Question 80

H₂PO₃^-

Answer 80

Dihydrogen Phosphite

Question 81

HSO₃^-

Answer 81

Hydrogen Sulfite

Question 82

O₂^2-

Answer 82

Peroxide

Question 83

H₃O⁺

Answer 83

Hydronium Ion