Question

Calcium is an element with atomic number 20 .starting reason answer each of the following question
i) is calcium a metal or non metal?
ii) will its atomic radius be larger or smaller than that of potassium with atomic number 19?
iii) write the formula of its oxide

Answer 1

Hey mate your answer is here

1 metal

2. smaller

3 CaO

Answer 2

metal because its valency is 2

smaller atomic radius than potassium because they are in same period and in period atomic radius decreases due to more protons or nuclear charge

formula of oxide =CaO

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