CBSE Class 9 Answered
How is valency calculated?
Why some elements have two or more valencies?
Asked by Vishalgarg1234 | 30 Nov, 2018, 07:35: PM
Expert Answer
The valency of an atom is equal to the number of electrons in the outer shell if that number is four or less. Otherwise, the valency is equal to eight minus the number of electrons in the outer shell.
Some elements show variable valency because of the different electronic configurations. An atom of an element can sometimes lose more electrons than are present in its valence shell i.e. loss from the penultimate shell and hence exhibit more than 1 or variable valency.
Answered by Varsha | 30 Nov, 2018, 08:11: PM
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