Q. 115.0( 4 Votes )

An element 'M' ha

Answer :

(a) The Electronic configuration of the element M = 2, 8, 2

(b) Group no is equal to the valence electrons for 1 to 3 valence electrons. So, 'M' belongs to the 2nd group.

(c)The period number will be given by the no. of shells present. So, 'M' belongs to the 3rd period.

(d) Since the element has 2 valence electrons and is therefore stable. So, Valency of 'M' is 2 .

(e)Elements with valence electron 1,2 and 3 are metals. ‘M’ has 2 electrons in its valence shell. So it is a metal.

(f) The formula of its oxide can be calculated as:

So, the formula for its oxide will be M₂O_2.

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