Element: Sodium, symbol: Na; formula: Na.
Properties:
–a solid at room temperature
–silver coloured
–very reactive (hence stored under oil)
Element: Oxygen, O; symbol:
O; formula: O2
Properties:
•a gas at room temperature
•transparent, clear, light passes through it
•chemically reactive -
very reactive when heated
Compound: Sodium oxide, Na2O
Properties:
•a gray solid at room temperature
•hygroscopic
•readily dissolves in
water