Question

Aluminium has positive valency.

Answer 1

• The number of electrons gain or loose by an atom to achieve inert gas configuration is called valency.
• The electronic configuration of aluminum ${\mathrm{Al}}_{13}=\underset{\mathrm{K}}{2},\underset{\mathrm{L}}{8},\underset{\mathrm{M}}{3}$
• So, to achieve inert gas configuration aluminum (Al) will lose 3 electrons and acquires a positive charge on it.

Thus, the valency of aluminum (Al) = +3