Predict the formula of Calcium Fluoride.

💡 Hint: Consider the charges: Ca is 2+, F is 1−

Predict the formula of Sodium Oxide.

💡 Hint: Na is 1+, O is 2−

Predict the formula of Aluminium Oxide.

💡 Hint: Al is 3+, O is 2−. This requires balancing!

Predict the formula of Magnesium Chloride.

💡 Hint: Mg is 2+, Cl is 1−

Predict the formula of Potassium Sulfide.

💡 Hint: K is 1+, S is 2−

Draw a dot-and-cross diagram for Magnesium Chloride (MgCl₂).

💡 Hint: Show 1 Mg losing 2e⁻, and 2 Cl each gaining 1e⁻. Use dots (•) for one element and crosses (×) for another.

Draw a dot-and-cross diagram for Calcium Fluoride (CaF₂).

💡 Hint: Ca loses 2e⁻, each F gains 1e⁻

Draw a dot-and-cross diagram for Magnesium Oxide (MgO).

💡 Hint: Mg loses 2e⁻, O gains 2e⁻. Perfect 1:1 match!

Draw a dot-and-cross diagram for Sodium Oxide (Na₂O).

💡 Hint: TWO Na atoms each lose 1e⁻, ONE O atom gains 2e⁻

Draw a dot-and-cross diagram for Aluminium Oxide (Al₂O₃). [COMPLEX!]

💡 Hint: This is the hardest one! 2 Al³⁺ ions and 3 O²⁻ ions needed for charge balance.

Explain why Magnesium Oxide has the formula MgO.

💡 Hint: Think about the charges and ratio needed.

Explain why ionic compounds have high melting points.

💡 Hint: Think about the forces between ions.

A student writes the formula of Calcium Chloride as CaCl. Explain the mistake.

💡 Hint: Check the charges!

Explain why Aluminium Oxide has the formula Al₂O₃ and not AlO.

💡 Hint: This needs charge balancing with LCM!

Describe what happens to electrons when Sodium reacts with Chlorine to form Sodium Chloride.

💡 Hint: Think about electron transfer.