What valency will be shown by an element having atomic number 15?

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Solution

(1)Atomic number of element=15
(2)So,electronic configuration=2,8,5
(3)As valency=Number of electrons in the valency shell or 8-number of valence electrons.
Therefore,the element will show a valency of 5 and 8-5=3.
Thus,the element will show valencies of 3 and 5.(The element having atomic number 15 is actually phosphorus).

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