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Common Polyatomic Ions

Formula

Charge

Name

OH

1-

Hydroxide

NO3

1-

Nitrate

NO2

1-

Nitrite

ClO3

1-

Chlorate

ClO2

1-

Chlorite

ClO1

1-

Hypochlorite

ClO4

1-

Perchlorate

C2H3O2

1-

Acetate

MnO4

1-

Permanganate

SO4

2-

Sulfate

SO3

2-

Sulfite

CO3

2-

Carbonate

CrO4

2-

Chromate

Cr2O7

2-

Dichromate

O2

2-

Peroxide

PO4

3-

Phosphate

PO3

3-

Phosphite

NH4

1+

Ammonium

How to Remember Most of Them:

__N__ick the __c__amel ate __c__lam for __s__upper in __P__hoenix

  • the underlined letters (first letters) represent the element

  • the amount of consonants in the word represent how many Oxygens are in the compound

  • the amount of vowels represents the charge

  • ate represents how each of these compounds end in “ate”

__N__ick: NO3 -1 Nitrate

__C__amel: CO3 -2 Carbonate

__Cl__am: ClO3 -1 Chlorate

__S__upper: SO4 -2 Sulfate

__P__hoenix: PO4-3 Phosphate

  • if you subtract one oxygen from each of these it becomes “base” + “ite” instead of “ate”

  • keeps the same charge

  • there is a carbonite but its unstable so I won’t show you that (It would be CO2 -2)

Nitrate NO3 -1 : NO2 -1 Nitrite

Chlorate ClO3 -1 : ClO2 -1 Chlorite

Sulfate SO4 -2 : SO3 -2 Sulfite

Phosphate PO4-3 : PO3 -3 : Phosphite

  • chlorate is super special

  • not only does it have chlorate and chlorite, but if you take away 2 oxygens instead of 1, you get hyper chlorite

  • and if you add one instead of take any away you get perchlorate

Perchlorate ClO4 -1

Chlorate ClO3 -1

Chlorite ClO2 -1

Hypochlorite ClO -1

We can also add a few more words to this, but they don’t follow the subtraction of oxygen rules:

__N__ick the __cr__abby __c__amel ate __c__lam, __c__rabgrass and __m__i__n__ts for __s__upper in __P__hoenix

__Cr__abby: CrO4 -2 Cromate

__Cr__abgrass: Cr2O7 -2 Dichromate

__M__i__n__ts: MnO4 -1 Permanganate

ES

Common Polyatomic Ions

Formula

Charge

Name

OH

1-

Hydroxide

NO3

1-

Nitrate

NO2

1-

Nitrite

ClO3

1-

Chlorate

ClO2

1-

Chlorite

ClO1

1-

Hypochlorite

ClO4

1-

Perchlorate

C2H3O2

1-

Acetate

MnO4

1-

Permanganate

SO4

2-

Sulfate

SO3

2-

Sulfite

CO3

2-

Carbonate

CrO4

2-

Chromate

Cr2O7

2-

Dichromate

O2

2-

Peroxide

PO4

3-

Phosphate

PO3

3-

Phosphite

NH4

1+

Ammonium

How to Remember Most of Them:

__N__ick the __c__amel ate __c__lam for __s__upper in __P__hoenix

  • the underlined letters (first letters) represent the element

  • the amount of consonants in the word represent how many Oxygens are in the compound

  • the amount of vowels represents the charge

  • ate represents how each of these compounds end in “ate”

__N__ick: NO3 -1 Nitrate

__C__amel: CO3 -2 Carbonate

__Cl__am: ClO3 -1 Chlorate

__S__upper: SO4 -2 Sulfate

__P__hoenix: PO4-3 Phosphate

  • if you subtract one oxygen from each of these it becomes “base” + “ite” instead of “ate”

  • keeps the same charge

  • there is a carbonite but its unstable so I won’t show you that (It would be CO2 -2)

Nitrate NO3 -1 : NO2 -1 Nitrite

Chlorate ClO3 -1 : ClO2 -1 Chlorite

Sulfate SO4 -2 : SO3 -2 Sulfite

Phosphate PO4-3 : PO3 -3 : Phosphite

  • chlorate is super special

  • not only does it have chlorate and chlorite, but if you take away 2 oxygens instead of 1, you get hyper chlorite

  • and if you add one instead of take any away you get perchlorate

Perchlorate ClO4 -1

Chlorate ClO3 -1

Chlorite ClO2 -1

Hypochlorite ClO -1

We can also add a few more words to this, but they don’t follow the subtraction of oxygen rules:

__N__ick the __cr__abby __c__amel ate __c__lam, __c__rabgrass and __m__i__n__ts for __s__upper in __P__hoenix

__Cr__abby: CrO4 -2 Cromate

__Cr__abgrass: Cr2O7 -2 Dichromate

__M__i__n__ts: MnO4 -1 Permanganate