The chemical formula for ruthenium (III) sulfide, scandium fluoride, osmium (VIII) oxide, manganese (II) sulfide, and platinum (IV) chloride are Ru₂S₃, ScF₃, OsO₄, MnS, and PtCl₄.
Ionic compounds are formed from metal and non-metal ions. The metal ions have positive ions and the non-metal ions have negative ions. To achieve stability, they use electrons together. The name of the ionic compound called the chemical formula.
A. Ruthenium (III) sulfide
- Positive ion ruthenium (III) = Ru⁺³
Will release three electrons - Negative ion sulfide = S⁻²
Will gain two electrons - Need 2 ions ruthenium (III) and 3 ions sulfide.
- Ru₂S₃
B. Scandium fluoride
- Positive ion scandium = Sc⁺³
Will release three electrons - Negative ion fluoride = F⁻
Will gain one electron - Need 1 ion scandium and 3 ions fluoride.
- ScF₃
C. Osmium (VIII) oxide
- Positive ion osmium (VIII) = Os⁺⁸
Will release eight electrons - Negative ion oxide = O⁻²
Will gain two electron - Need 1 ion scandium and 4 ions oxide.
- OsO₄
D. Manganese (II) sulfide
- Positive ion manganese (II) = Mn⁺²
Will release two electrons - Negative ion sulfide = S⁻²
Will gain two electron - Need 1 ion scandium and 1 ion sulfide.
- MnS
E. Platinum (IV) chloride
- Positive ion platinum (IV) = Pt⁺⁴
Will release four electrons - Negative ion chloride = Cl⁻
Will gain two electron - Need 1 ion platinum and 4 ions chloride.
- PtCl₄
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