Writing Ionic Formulas: Practice Problems

TL;DR

Learn how to write formulas for ionic compounds by balancing the charges of metal and non-metal elements.

Transcript

We’ll do a few more examples of how to write these ionic compounds. We’ll go a lot faster. Okay, Calcium Fluoride, Calcium is here, Fluorine or Fluoride is here, metal and nonmetal, we want to talk about charges. So Calcium is in this column which makes it Ca two-plus (Ca2+) Fluorine-- fluoride is in this column so it's going to be one minus (F-). ... Read More

Key Insights

• 🤘 Writing formulas for ionic compounds involves balancing the charges of metal and non-metal elements.
• 🤘 The charges of the metal and non-metal elements determine the number of each atom needed in the compound.
• 🫀 Formulas for binary ionic compounds consist of only two types of atoms.
• 🈂️ Balancing charges may require adding or subtracting atoms to achieve charge equilibrium.
• 🚰 The periodic table is used to determine the charges of the elements.
• 😑 Transitional metals and polyatomic ions require different methods for writing their formulas.
• 🥳 The formula for an ionic compound indicates the ratio of atoms.

Questions & Answers

Q: How do you write the formula for Calcium Fluoride?

Calcium is Ca2+ and Fluorine is F-. To balance the charges, an additional Fluorine atom is added, resulting in the formula CAF2.

Q: Is Magnesium Oxide already balanced?

Yes, Magnesium is Mg2+ and Oxide is O2-. Since the charges are already balanced, the formula remains as MgO.

Q: How do you balance the charges in Strontium Phosphide?

Strontium is Sr2+ and Phosphide (Phosphorus) is P3-. By adding more Strontium atoms, the charges are balanced, resulting in the formula Sr3P2.

Q: Why are these formulas referred to as formulas of binary ionic compounds?

These formulas are called binary because they consist of only two types of atoms - a metal and a non-metal.

Summary & Key Takeaways

• Calcium Fluoride: Calcium (Ca2+) and Fluorine (F-) charges are balanced by adding an additional Fluorine atom, resulting in the formula CAF2.

• Magnesium Oxide: Magnesium (Mg2+) and Oxide (O2-) charges are already balanced, so the formula is MgO.

• Strontium Phosphide: Strontium (Sr2+) and Phosphide (P3-) charges are balanced by adding more Strontium atoms, resulting in the formula Sr3P2.