Question

Atomic number of aluminium is 13 then what is its valency

Answer 1

atomic number of Aluminium is 13

electronic configuration of Aluminium is
2,8,3

it has 3 electrons in its valence shells so it will give out 3 electrons hence the valency of Aluminium is + 3

Answer 2

Valency of aluminium is +3. i.e. it gives 3 electrons to satisfy its octate configuration. Electronic configuration of aluminium is

K shell- 2(complete)

L shell- 8(complete)

M shell-3(incomplete)