Atoms, molecules and stoichiometry — practice question

Under room conditions, $1.15\ \text{g}$ of a metallic element requires $300\ \text{cm}^3$ of oxygen to react fully and produce an oxide containing $\text{O}^{2-}$ ions. What might the metallic element be?

• Acalcium
• Bmagnesium
• Cpotassium
• Dsodium