question_answer

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.

Answer:

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

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

(iii) CaO.