Question

What group is sodium in?

Answer 1

`1^(st)` group

Explanation:

Sodium is in 1st group in modern periodic table.
`Na(11)= 1s^2, 2s^2, 2p^6, 3s^1`
Last electron enters into s subshell states that `Na` belongs to S-block.

And, `Na` has valency of 1 electron so, it belongs to `1^(st)` group.

In addition to it, `Na` is a alkali metal. Alkali metals belongs to `1^(st)` group.