Calcium is an element with atomic number 20. ...

CBSE Class 10 Science 2016 Term II Delhi Set 1

Question : 9 of 36

Marks: +1, -0

Calcium is an element with atomic number

20. Stating reason answer 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.

Solution:

(i) Calcium is a metal, since it looses electrons.

(ii) Radius of calcium is smaller than potassium as atomic size decreases in a period.

(iii)

\mathrm{CaO}

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