Question

Fill in the blanks :

The number of electrons lost or gained by an atom is known as --------.

Answer 1

• Valency is defined as number of electrons lost or gained by an atom to achieve the nearest noble gas electronic configuration.
• For example, valency of normal Sodium atom( Z = 11) is 1 as it loses one electron to achieve the nearest noble gas electronic configuration of Neon.
• The number of electrons lost or gained by an atom is known as valency.