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Characteristics of Chemical Reaction

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Question

Fill in the blanks :
The number of electrons lost or gained by an atom is known as --------.

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Solution

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.

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