Naming Ionic Compounds Worksheet for students to practice identifying chemical formulas.

Let's solve the Naming Ionic Compounds Worksheet step by step. We'll name each ionic compound using standard naming rules for ionic compounds, including:

- Cations (positive ions): Metals (especially transition metals) may have variable charges, so we use Roman numerals in parentheses if needed.
- Anions (negative ions): Nonmetals end in "-ide". Polyatomic ions have specific names (e.g., sulfate, nitrate, etc.).
- Polyatomic ions: Recognize common ones like NO₃⁻ (nitrate), SO₄²⁻ (sulfate), PO₄³⁻ (phosphate), NH₄⁺ (ammonium), etc.

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1) TiSe

- Ti = Titanium
- Se = Selenium → selenide
- Ti is a transition metal with variable charge.
- Se has a -2 charge → Se²⁻
- So Ti must be +2 to balance → Ti²⁺
- Name: Titanium(II) selenide

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2) Cu₂O

- Cu = Copper
- O = Oxygen → oxide
- O²⁻ → two O atoms give -2 total charge
- Two Cu atoms must balance that → each Cu is +1
- Cu⁺ is copper(I)
- Name: Copper(I) oxide

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3) V₃P₅

- V = Vanadium
- P = Phosphorus → phosphide
- P³⁻ → five P atoms → 5 × (-3) = -15 charge
- Three V atoms must balance → each V = +5
- V⁵⁺ → vanadium(V)
- Name: Vanadium(V) phosphide

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4) Co(ClO₃)₂

- Co = Cobalt
- ClO₃⁻ = chlorate ion
- Two ClO₃⁻ → 2 × (-1) = -2 charge
- So Co must be +2 → Co²⁺
- Cobalt(II)
- Name: Cobalt(II) chlorate

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5) Pb(SO₄)₂

- Pb = Lead
- SO₄²⁻ = sulfate
- Two SO₄²⁻ → 2 × (-2) = -4 charge
- So Pb must be +4 → Pb⁴⁺
- Lead(IV)
- Name: Lead(IV) sulfate

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6) CuCrO₄

- Cu = Copper
- CrO₄²⁻ = chromate
- Charge of CrO₄²⁻ = -2
- So Cu must be +2 → Cu²⁺
- Copper(II)
- Name: Copper(II) chromate

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7) (NH₄)₃PO₄

- NH₄⁺ = ammonium (polyatomic cation)
- PO₄³⁻ = phosphate
- Name: Ammonium phosphate

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8) Cu(NO₂)₂

- Cu = Copper
- NO₂⁻ = nitrite (not nitrate!)
- Two NO₂⁻ → 2 × (-1) = -2
- So Cu = +2 → Cu²⁺
- Name: Copper(II) nitrite

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9) KCN

- K⁺ = potassium
- CN⁻ = cyanide (polyatomic anion)
- Name: Potassium cyanide

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10) Zn₃N₂

- Zn = Zinc
- N = Nitrogen → nitride
- N³⁻ → two N atoms → -6 total
- Three Zn atoms → each must be +2 → Zn²⁺
- Zinc typically forms only +2 ion (fixed charge)
- Name: Zinc nitride

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11) NaMnO₄

- Na⁺ = sodium
- MnO₄⁻ = permanganate
- Name: Sodium permanganate

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12) Co₃(PO₄)₂

- Co = Cobalt
- PO₄³⁻ = phosphate
- Two PO₄³⁻ → 2 × (-3) = -6
- Three Co atoms → total charge +6 → each Co = +2
- So Co²⁺ → cobalt(II)
- Name: Cobalt(II) phosphate

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13) Li₂O

- Li⁺ = lithium
- O²⁻ = oxide
- Name: Lithium oxide

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14) Fe(C₂H₃O₂)₃

- Fe = Iron
- C₂H₃O₂⁻ = acetate
- Three acetate ions → 3 × (-1) = -3
- So Fe = +3 → Fe³⁺
- Iron(III)
- Name: Iron(III) acetate

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15) Sr(OH)₂

- Sr = Strontium
- OH⁻ = hydroxide
- Two OH⁻ → -2 charge → Sr²⁺
- Strontium always +2
- Name: Strontium hydroxide

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16) Cd(NO₃)₂

- Cd = Cadmium
- NO₃⁻ = nitrate
- Two NO₃⁻ → -2 → Cd²⁺
- Cadmium usually +2
- Name: Cadmium nitrate

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17) CuO

- Cu = Copper
- O²⁻ = oxide
- One O → -2 → Cu must be +2 → Cu²⁺
- Name: Copper(II) oxide

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18) PbS

- Pb = Lead
- S²⁻ = sulfide
- Sulfide is -2 → Pb must be +2 → Pb²⁺
- Lead can be +2 or +4; here it’s +2
- Name: Lead(II) sulfide

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19) Mn(ClO₂)₇

Wait — this formula seems incorrect. Let’s check:
- ClO₂⁻ = chlorite ion (charge = -1)
- Seven ClO₂⁻ → 7 × (-1) = -7
- So Mn must be +7 → Mn⁷⁺
- But manganese doesn't commonly form +7 in ionic compounds (it does in MnO₄⁻, but not as Mn⁷⁺ in salts).

But wait — the formula Mn(ClO₂)₇ is not chemically reasonable because:
- Mn has a maximum oxidation state of +7, but it would require 7 ClO₂⁻ ions → total -7 charge
- Mn⁷⁺ is extremely rare and unstable.

But perhaps it's a typo? Or maybe it's Mn(ClO₂)₂?

Wait — let's recheck: Mn(ClO₂)₇ — that’s 7 chlorite ions → -7 total charge → Mn must be +7.

Actually, manganese heptachlorite isn't common, but theoretically possible.

So:
- Mn⁷⁺ → manganese(VII)
- ClO₂⁻ = chlorite
- Name: Manganese(VII) chlorite

But this is unusual. Double-checking: Is it possible?

Yes, in theory, though very rare. So assuming the formula is correct:

→ Manganese(VII) chlorite

But more likely, there might be a typo. However, since it's written as Mn(ClO₂)₇, we’ll go with it.

✔ Manganese(VII) chlorite

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20) NH₄HSO₃

- NH₄⁺ = ammonium
- HSO₃⁻ = hydrogen sulfite (bisulfite)
- This is a salt of bisulfite
- Name: Ammonium hydrogen sulfite
(or Ammonium bisulfite, both acceptable)

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✔ Final Answers:

1) Titanium(II) selenide
2) Copper(I) oxide
3) Vanadium(V) phosphide
4) Cobalt(II) chlorate
5) Lead(IV) sulfate
6) Copper(II) chromate
7) Ammonium phosphate
8) Copper(II) nitrite
9) Potassium cyanide
10) Zinc nitride
11) Sodium permanganate
12) Cobalt(II) phosphate
13) Lithium oxide
14) Iron(III) acetate
15) Strontium hydroxide
16) Cadmium nitrate
17) Copper(II) oxide
18) Lead(II) sulfide
19) Manganese(VII) chlorite
20) Ammonium hydrogen sulfite (or Ammonium bisulfite)

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📝 Notes:

- Transition metals (like Cu, Fe, Co, Cr, Mn, Pb, etc.) often need Roman numerals.
- Fixed-charge metals (like Na, K, Li, Zn, Cd, Al) don’t need Roman numerals.
- Polyatomic ions must be memorized (e.g., NO₃⁻, SO₄²⁻, PO₄³⁻, OH⁻, CN⁻, etc.)
- Hydrogen sulfite (HSO₃⁻) is also called bisulfite.

Let me know if you want a version formatted for printing or need explanations on any specific compound!