Which of the following represents the correct order of incre... | Chemistry | SolveeIt

Question

Which of the following represents the correct order of increasing first ionisation enthalpy for $Ca, Ba, S, Se$ and $Ar$ ?

$Ca < S < Ba < Se < Ar$

$S< Se < Ca < Ba < Ar$

$Ba < Ca < Se < S < Ar$

$Ca < Ba < S < Se < Ar$

Answer

$Ba < Ca < Se < S < Ar$

Explanation

Solution

As we move down the group, the ionization enthalpy decreases. Consequently, the ionization energy of $Ba < Ca$ and $Se < S$ .
Generally, ionization energy increases from left to right within a period. Hence, $S < Ar$ and $Ca < Se$ .

Therefore, the correct sequence of increasing ionization enthalpies is option (C): $Ba < Ca < Se < S < Ar$ .

Chemistry Question on Classification of elements & periodicity in properties

Solution