Question

Use Mendeleev's Periodic Table to predict the formula of

(a) hydrides of carbon and silicon

(b) oxides of potassium, aluminium and barium.

Answer 1

(a)C is in Group 4. So, the hydride will be CH₄ (Methane).
Si is in Group 4. So, the hydride will be SiH₄ (Silane).

(b)

K is in Group 1. So, the oxide will be K₂O (Potassium oxide).
Al is in Group 3. So, the oxide will be Al₂O₃ (Aluminium oxide).
Ba is in Group 2. So, the oxide will be BaO (Barium oxide).