How does number of valence electrons vary on moving from left to right in the second period of a periodic table ?

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Solution

The correct option is D $4$
On moving from left to right in any period valence electrons keeps on increasing and period gets over when that valence shell gets filled.In the second period as it has both s and p orbitals it can fit $8$ electrons that is it can have $8$ elements.In first and second group elements has $1$ and $2$ valence electrons respectively where as from 13th group it starts again with $3$ ;in $14$ it has $4$ and so on valence electrons.

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Q. Moving right to left in the second period, number of valence electrons ___________ :

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