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

increases

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decreases

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constant

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none of these

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Solution

The correct option is B decreases
As we move from right to left in any period valence electrons decreases. Period is completed when a particular shell is completely filled in that period. Hence as we move from left to right, number of valence electrons increases and vice versa for the right to left i.e. number of valence electrons decreases.

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Similar questions

How does number of (i) valence electrons (ii) valency ;vary on the moving from left to right :

(a) in the second period of a periodic table ?

(b) in the third period of a periodic table ?

Fill in the blanks in the following statements :

(a) The horizontal rows in a periodic table are called .............

(b) In going across a period (right to left) in the periodic table, the atomic size of the atom .............

(d) When we down in a group in the periodic table, the metallic character of elements ..............

(e) The tendency to gain an electron ................ on moving down in a group of the periodic table.

The total number of valence electrons in 4.2 gm of ${N_{3}}^{-}$ ion is ( $N_{A}$ is the Avogadro's number )

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