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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