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Calcium is an element with atomic number...

Calcium is an element with atomic number 20. Stating reason for each of the following questions :
(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.

Text Solution

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(i) It is a metal.
Because, it has two electrons in its outermost shell/two valence electrons, which it can lose easily.
(ii) K (19) is placed before Ca (20) in the same period/fourth period.
Since the atomic radius decreases along a period, the atomic radius of calcium is smaller than that of potassium.
(iii) The formula of oxide of calcium is Cao, because the valency of calcium as well as that of oxygen is 2.
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OSWAAL PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-TOPIC:2- SHORT ANSWER TYPE QUESTIONS-II
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  19. The atomic number of an element 'X' is 20. (i) Determine the positio...

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