Calcium is an element with z = 20 (a) is it a metal or a non-metal? (b) will its size be bigger or smaller than that of potassium? (c) write the formula of its chloride
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1) Calcium is a metal because it has 2 electrons in its outermost shell which can be lost easily.
2) It is smaller than the potassium.
3)Formula of its chloride is CACL2
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Ans. Z = 20 is 2, 8, 8, 2
(i) It is a metal which has two valence electrons it is present in group 2
(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 and its formula.
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