Question

Write number of valence electrons present in the atoms of Na,Mgand Al

Answer 1

Na is 1 .mg is 2 and Al is 3 these r the valence electrons

Answer 2

Heya !!!!

★ ------ Here it is -------★


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Electronic configuration of Sodium ( Na )

= 2 , 8 , 1
Valence electrons = Number of electrons in outermost shell

So no of valence electron in sodium = 1

Similarly
Electronic configuration of Mg = 2 , 8 , 2

So no of valence electron = 2

And

Electronic configuration of Al = 2 , 8 , 3

so no of valence electron = 3

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Hope its helped you !!!