Question

Explain
1) How does basic character of oxides and hydroxides changes down the group of alkali metal?
2) How does reducing power of alkali metals changes down the group?

Answer 1

All the alkali metals are silvery white, soft and light metals. Because of the large size, these elements have low density which increases down the group from Li to Cs. However, potassium is lighter than sodium. ... The alkali metals and their salts impart characteristic colour to an oxidizing flame.

Answer 2

that's why they are not component group because at a metal is used from recording power of Atlas fibre