Question

A metal (mass no=40) having same number of protons and neutrons, combines with two chlorine atoms. Identify the element and what the valency of this element?

With which element does the electronic configuration of this metal in combined state match?

Answer 1

This element is calcium.....

It contains 10 protons and 10 neutrons.....

It's valency is 2....

Its electronic configuration is same as that of group 2 elements as it is in group 2.......

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