Define valency . How does it vary along a period?
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the number of electrons that must be lost or gained by an atom to obtain a stable electron configuration. In the periodic table period, the valency of an element first increases and then decreases. ... The valency varies from +1 to +4 or -4 through these 8 elements, in the first 4 elements of these 8 elements.
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Explanation:
Defination :-
The number of electrons that must be lost or gained by an atom to obtain a stable electron configuration is known as valency .
In the periodic table period, the valency of an element first increases and then decreases.The valency varies from +1 to +4 or -4 through these 8 elements, in the first 4 elements of these 8 elements.
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