R.R. Mishra Solutions for Exercise 1: FORMATIVE ASSESSMENT QUESTIONS FOR CCE

Which of the following pairs of elements would you expect to have lower atomic radius? Justify your answer.

(i) $\mathrm{Na}, \mathrm{K}, \mathrm{Ca}$

(ii) $\mathrm{He}, \mathrm{Li}, \mathrm{B}$

(iii)$\mathrm{Fe}, \mathrm{Co}, \mathrm{Zn}$

Name an element that has two shells, each one of which is completely filled with electrons.

Name the element which has electronic configuration $2,8,2$.

Name an element which has a total of three shells and there are four electrons in its valence shell.

Name an element which has a total of two shells and there are three electrons in its valence shell.

Name an element which has twice as many electrons in its second shell as in the first shell.

The electronic configuration of an element $\mathrm{X}$ is $2, 8, 7$.

Element $\mathrm{X}$ will show its properties similar to which element—$\mathrm{N}$ or $\mathrm{F}$?

The electronic configuration of an element $\mathrm{X}$ is $2, 8, 7$.

Write the period to which $\mathrm{X}$ may belong in the periodic table.