Question

An element 'Y' belongs to 4th period and IIA (2) group of the periodic
table. State (i) The no.of valence electrons in it (ii) The valency​

Answer 1

Explanation:

the given element is calcium. also without using it since it is in group 2 so electronic configuration will be ns²

in this case it will be 4s² for the valence shell of Y

so number of valence electrons in it is 2

and valency will be 2 as 2<4

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