sentence: Sodium is a light, silver-coloured metal.
sentences_after: Sodium is so soft that it can be easily cut with a knife. When it is cut, the surface will become white after a bit of time. This is because it reacts with air to form sodium hydroxide and sodium carbonate. This reaction is very fast. Hydrogen and sodium hydroxide are produced.
concept_name: sodium
headings: Sodium Properties
categories: Alkali metals Chemical elements