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Calcium is an element with atomic number...

Calcium is an element with atomic number 20.
(i) Is it a metal or non-metal ?
(ii) Will its size be more or smaller than chat of potassium?
(iii) Write the formula of its chloride.

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The electronic configuration of calcium (Z = 20) is 2, 8, 8, 2.
(i) Since it has only two valence electrons, it is present in group 2. It is a metal.
(ii) Both potassium (K) and calcium (Ca) are present in fourth period. Since atomic size decreases along a period, calcium is smaller in size.
(iii) The valency of calcium is 2. The formula of its chloride is `CaCl_(2).`
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