Question

Calcium is an element with atomic number 20 stating reason answer each of the following questions 1st is calcium a metal or nonmetal 2 will it atomic radius be larger or smaller than that of the potassium 3 write the formula of its oxide

Answer 1

Dear student
(i) Calcium is a metal , it has two electrons in its outermost shell which it can loose easily.
(ii) K is placed before Ca in the same period (fourth period),as the no. of proton will increase then radius will decrease along a period, the atomic radius of calcium is smaller than that. of potassium.
(iii) The formula of its oxide is CaO, because the valency of calcium as well as that of oxygen is 2.

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