Question

Arrange the elements $Se,Cl$ and $S$ in the increasing order of ionisation energy.

• A. $Se>S>Cl$
• B. $Se<S<Cl$
• C. $Se<S>Cl$
• D. None of the above

Answer 1

Answer: (B)

$Se<S<Cl$

Ionisation energy is the energy required to remove one electron from a neutral atom of an element. $S$ and $Se$ belong to VIA group elements. Down the group ionisation energy decreases so $S$ is having more IE value than $Se.$

$S$ and $Cl$ are the elements of the same period the IE value increases from left to right. So, $Cl$ is having more IE value than $S$.

So the correct order of IP is $Se<S<Cl$

Hence option $B$ is correct.