Group 1 alkali metals The Group 1 elements, also known as the alkali metals, all react vigorously with water to produce an alkaline solution. Group 7 halogens The Group 7 elements are also known ...

When the alkali metals are cut, they initially appear shiny grey but quickly become dull and white as they react with oxygen in the air. This is known as tarnishing. Sodium tarnishes more quickly ...

The observed rate of growth indicates that an atom from the vapour phase that ... although most of them have not seen alkali-metal whiskers, the paraffin-coating pioneer, Hugh Robinson (now ...