Ions that are themselves composed of two or more atoms linked by the same covalent bonds that hold molecules together... but they have a charge. Trick to identify the charge: If the total of the group numbers of the atoms is odd, it will have a charge of 1-. (Except for phosphate, -3.) If the total is even, it will have a charge of 2-. -ate has one more Oxygen than -ite.

ammonium (Note that the only positive common polyatomic ions are this, and hydronium H3O+. Note that ammonium is different from the compound ammonia, NH3.)

Nitrate (Hint: Nina, 3 girls. Nitrite is NO2-.)

Polyatomic Ions Flashcards by R B

Polyatomic ions

Ions that are themselves composed of two or more atoms linked by the same covalent bonds that hold molecules together… but they have a charge.
Trick to identify the charge: If the total of the group numbers of the atoms is odd, it will have a charge of 1-. (Except for phosphate, -3.) If the total is even, it will have a charge of 2-.
-ate has one more Oxygen than -ite.

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NH₄+

ammonium

(Note that the only positive common polyatomic ions are this, and hydronium H₃O+.

Note that ammonium is different from the compound ammonia, NH₃.)

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H3O +

hydronium (always in aqueous solutions)

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CN -

cyanide

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OH -

hydroxide

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NO₂-

nitrite

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NO₃ -

Nitrate

(Hint: Nina, 3 girls. Nitrite is NO₂-.)

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ClO -

or OCl -

Hypochlorite

(Order: hypochlorite, chlorite, chlorate, perchlorate)

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ClO₂ -

Chlorite

(Order: hypochlorite, chlorite, chlorate, perchlorate)

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ClO₃-

Chlorate

(Order: hypochlorite, chlorite, chlorate, perchlorate)

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ClO_{<span>4</span>} -

perchlorate

(Order: hypochlorite, chlorite, chlorate, perchlorate)

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MnO₄ -

permanganate

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C₂H₃O₂ -

acetate

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C₂O₄^2-

oxalate

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CO₃ ^2-

carbonate

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HCO₃ -

hydrogen carbonate

aka bicarbonate ion

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SO₃ ^2-

sulfite

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HSO₃ -

hydrogen sulfite

aka bisulfite

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SO₄ ^2-

sulfate

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HSO₄ -

hydrogen sulfate

aka bisulfate

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SCN ^-

thiocyanate

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S₂O₃^2-

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thiosulfate

(Hint: Two weird sulfur. Thiree-O’s.)

CrO₄^2-

Study These Flashcards

chromate

(dichromate is Cr₂O₇^2-)

Cr₂O₇ ^2-

Study These Flashcards

dichromate

(just chromate is CrO_{4<span> </span>}^2-)

PO₄^3-

phosphate

HPO₄^2-

monohydrogen phosphate (meanwhile dihydrogen phosphate just has another H: H₂PO₄-)

H₂PO₄^-

dihydrogen phosphate (one more hydrogen than hydrogen phosphate HPO₄ ^2-)

# What is the formula for this polyatomic ion? ammonium

NH₄+

# What is the formula for this polyatomic ion? hydronium (always in aqueous solutions)

H3O +

# What is the formula for this polyatomic ion? cyanide

CN -

# What is the formula for this polyatomic ion? ## Footnote hydroxide

OH -

# What is the formula for this polyatomic ion? nitrite

NO₂-

# What is the formula for this polyatomic ion? Nitrate

NO₃ -

# What is the formula for this polyatomic ion? Hypochlorite (Order: hypochlorite, chlorite, chlorate, perchlorate)

ClO - or OCl -

# What is the formula for this polyatomic ion? Chlorite (Order: hypochlorite, chlorite, chlorate, perchlorate)

ClO₂ -

# What is the formula for this polyatomic ion? Chlorate (Order: hypochlorite, chlorite, chlorate, perchlorate)

ClO₃

# What is the formula for this polyatomic ion? perchlorate (Order: hypochlorite, chlorite, chlorate, perchlorate)

ClO₄ -

# What is the formula for this polyatomic ion? permanganate

MnO₄ -

# What is the formula for this polyatomic ion? acetate

C₂H₃O₂ - Pam writes this as CH₃COO (Either works.)

# What is the formula for this polyatomic ion? oxalate

C₂O₄^2-

# What is the formula for this polyatomic ion? carbonate

CO₃ ^2-

# What is the formula for this polyatomic ion? hydrogen carbonate aka bicarbonate ion

HCO₃ -

# What is the formula for this polyatomic ion? sulfite

SO₃ ^2-

# What is the formula for this polyatomic ion? hydrogen sulfite aka bisulfite

HSO₃ -

# What is the formula for this polyatomic ion? sulfate

SO₄ ^2-

# What is the formula for this polyatomic ion? hydrogen sulfate aka bisulfate

HSO₄ -

# What is the formula for this polyatomic ion? thiocyanate

SCN ^-

# What is the formula for this polyatomic ion? thiosulfate

S₂O₃^2- (Hint: Two weird, thio-three O.)

# What is the formula for this polyatomic ion? chromate

CrO₄^2-

# What is the formula for this polyatomic ion? dichromate

Cr₂O₇ ^2-

# What is the formula for this polyatomic ion? phosphate

PO₄^3-

# What is the formula for this polyatomic ion? monohydrogen phosphate

HPO₄^2-

# What is the formula for this polyatomic ion? dihydrogen phosphate

H₂PO₄^-

Polyatomic Ions Flashcards

Memorize Table 2.5 for Test 1 (53 cards)