Question

ionic bonds
chemical naming practice
name the following ionic compounds (rule 1 and 2):

1. nabr
2. cao
3. li₂o
4. mgbr₂
5. mgbr₂
6. be(oh)₂
7. fecl₃
8. pbo
9. (nh₄)so₄
10. cos

write the formulas for the following ionic compounds (rule 1 and 2). must show all work!!

1. potassium iodine
2. magnesium oxide
3. aluminum chloride
4. sodium nitrate

Explanation:

Step1: Naming ionic compounds

For ionic compounds, the name of the cation (positive ion) is written first, followed by the name of the anion (negative ion). For metals that can have multiple charges (like Fe, Pb, Co), the charge is indicated in Roman numerals in parentheses.

• NaBr: Sodium (Na⁺) and bromide (Br⁻) → Sodium bromide
• CaO: Calcium (Ca²⁺) and oxide (O²⁻) → Calcium oxide
• Li₂O: Lithium (Li⁺) and oxide (O²⁻) → Lithium oxide
• MgBr₂: Magnesium (Mg²⁺) and bromide (Br⁻) → Magnesium bromide
• Be(OH)₂: Beryllium (Be²⁺) and hydroxide (OH⁻) → Beryllium hydroxide
• FeCl₃: Iron (Fe³⁺, since 3 Cl⁻ each with -1 charge) and chloride (Cl⁻) → Iron(III) chloride
• PbO: Lead (Pb²⁺, since O²⁻) and oxide (O²⁻) → Lead(II) oxide
• (NH₄)₂SO₄: Ammonium (NH₄⁺) and sulfate (SO₄²⁻) → Ammonium sulfate
• CoS: Cobalt (Co²⁺, since S²⁻) and sulfide (S²⁻) → Cobalt(II) sulfide

Step2: Writing formulas for ionic compounds

Use the charges of the ions to determine the subscripts.

• Potassium iodide: Potassium (K⁺) and iodide (I⁻) → KI (since +1 and -1 balance)
• Magnesium oxide: Magnesium (Mg²⁺) and oxide (O²⁻) → MgO (since +2 and -2 balance)
• Aluminum chloride: Aluminum (Al³⁺) and chloride (Cl⁻) → AlCl₃ (3 Cl⁻ needed to balance +3)
• Sodium nitrate: Sodium (Na⁺) and nitrate (NO₃⁻) → NaNO₃ (since +1 and -1 balance)

Answer:

1. Sodium bromide
2. Calcium oxide
3. Lithium oxide
4. Magnesium bromide
5. Beryllium hydroxide
6. Iron(III) chloride
7. Lead(II) oxide
8. Ammonium sulfate
9. Cobalt(II) sulfide
10. KI
11. MgO
12. AlCl₃
13. NaNO₃