A moderately reactive metallic element (whose melting point is 850°C) burns in a container of a greenish gas (also an element) to produce a white solid. The white solid dissolves in water to form a clear solution. When carbon dioxide gas, CO₂, is bubbled into this solution, it produces a white precipitate. Identify, by names and formulas, the substances referred to as the white solid and the white precipitate. Use a handbook of chemistry to obtain any data you may need.