Question

define valency . write the valency of magnesium atom having the atomic number 12​

Answer 1

Answer:

valency is the combining capacity of atoms of elements in order to gain an octet state on the last shell pf the atom

magnesium has two electrons in its last shell thus it's valency is 2 because it will give donate 2 electrons in order to gain an octet state in the las t shell

Answer 2

Answer:

The combining capacity of an atom is known as its valency.

The number of bonds that an atom can form as part of a compound is expressed by the valency of the element.

Valency of magnesium atom:

atomic number: 12

electronic configuration: 2, 8, 2

Valence electrons: 2

To achieve its stability, Mg atom removes 2 electrons in its outermost shell.

Hence:

Valency: 2