Question

Calcium is an element with atomic number 20. Stating reason answer each of the following questions : (i) is calcium a inctal or non-motal ? (ii) Will its atomic radius be larger or smaller than that of potassium with atomic number 19? (iii) Write the formula ofits oxide

Answer 1

iii) calcium oxide = CaO

ii)atomic radius of calcium is smaller than that of potassium

i)calcium is a metal (alkaline earth metal)

Answer 2

Dear Student,

◆ Answer -

1. Metal
2. Smaller
3. CaO

● Explaination -

(i) Electronic configuration of calcium is 2, 8, 8, 2. As it lies in group 2 of modern periodic table, calcium is metal.

(ii) Atomic radius of elements decreases from left to right across a period. As calcium is on right of potassium in same period, it will have smaller radius than potassium.

(iii) From electronic configuration of calcium, its valence is 2+. Thus formula of its oxide will be CaO.

Thanks dear...