Question

Alkali Metals are soft but whey they combine with non metals form hard crystalline solids why?

Answer 1

Ahoy dear user!!!!!!!

Here is your answer -------->>>

Alkali metals are soft because of weak inter-mettalic bonding in their kernels.........

But they become crystalline when bonded with a non-metal due to strong electrostatic force of attraction which prevents them from becoming soft and hence they are hard and can't be cut with a knife.

Hope it helps