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Question

Calcium is an element with the atomic number $$20$$.

(i) Will it be a metal or non-metal?
(ii) What will be its valency?
(iii) What would be the formula of its chloride?
(iv) Will it be smaller or larger than potassium?


Solution

The atomic no. of calcium is 20.
Electronic configuration $$= 2, 8, 8, 2$$

The valence electrons in calcium are $$2$$. Thus it is a metal of group $$2$$.

The valency of calcium is $$+2$$ as it has $$2$$ valence electrons.

The chloride of calcium is $$Ca{Cl}_{2}$$ as the valency of chloride ion is $$-1$$ and that of calcium is $$+2$$.

It is smaller than $$K$$ as both elements lie in the third period of the periodic table but $$K$$ lies to the left of $$Ca$$ in the period and we know that atomic size decreases as move right in a period.

Chemistry

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