Q. 95.0( 3 Votes )

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Answer :

Electronic configuration of ‘X’ is 2, 8, 8, 2.

(a) X belongs to period 4 because it has 4 energy shells.

(b) Since X has 2 valence electrons, so it belongs to group no. 2.

(c) The valency of X is 2 because it can acquire stable gas configuration by losing 2 electrons.

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