Question :

How will you find the valency of chlorine, Sulphur, and magnesium? Explain with some examples.

Science

Class 9

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Knowledge Kirti

If the number of electrons in the outermost shell of the atom of an element is less than or equal to 4, then the valency of the element is equal to the number of electrons in the outermost shell.

On the other hand, if the number of electrons in the outermost shell of the atom of an element is greater than 4, then the valency of that element is determined by subtracting the number of electrons in the outermost shell from 8. Therefore, the distribution of electrons in chlorine, sulphur, and magnesium atoms are 2, 8, 7; 2, 8, 6 and 2, 8, 2 respectively.

Therefore, the number of electrons in the outer most shell of chlorine, sulphur, and magnesium atoms are 7, 6, and 2 respectively. Therefore,

Valency of chlorine = 8 -7 = 1

Valency of sulphur = 8 - 6 = 2

Valency of magnesium = 2

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