Question

How to find valency of zinc?

Answer 1

first get the atomic no. that's 30
now make an octet
2,8,18,2
valency is 2

Answer 2

The "valency of a zinc" atom is 2.

Explanation:

Zinc (Zn) is the 30th element in the periodic table, which means that the total number of atoms in zinc is 30. Based on this we can calculate the number of orbitals and the electrons present in each orbital as follows:

Orbital 1: $1s^2$

Orbital 2: $2s^2$;$2p^6$

Orbital 3: $3s^2$; $3p^6$; $3d^{10}$

Orbital 4: $4s^2$

As there are only 2 electrons in the last orbital, a zinc atom can lose those electrons and gain a positive charge to form $Zn^{2+}$. Therefore, the "valency of a zinc" atom is 2.