Q. Which of the following relation is correct?
A) $I^{st}\ IE\ of\ C > I^{st}\ IE\ of\ B$
B) $I^{st}\ IE\ of\ C < I^{st}\ IE\ of\ B$
C) ${II}^{nd}\ IE\ of\ C > {II}^{nd}\ IE\ of\ B$
D) Both (b) and (c)
Explanation
(a)
$\ _{6}C \rightarrow 1s^{2},\ 2s^{2},\ 2p^{2}$
$\ _{5}B \rightarrow 1s^{2},\ 2s^{2},\ 2p^{1}$
In first case $IE_{1}$ of C > $IE_{1}$ of B. Since, carbon is smaller than B in size. But $IE_{2}(B) > IE_{2}(C)$ because electron are paired as well as present in inner $s$-orbital whereas for carbon it will be still in $2p$-orbital and in unpaired state
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.