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

Question

Which of the following represents the correct order of increasing first ionisation enthalpy for Ca, Ba, S, Se and Ar ? (A) Ca < S < Ba < Se < Ar (B) S< Se < Ca < Ba < Ar  (C) Ba < Ca < Se < S < Ar (D) Ca < Ba < S < Se < Ar

Tardigrade Admin · Accepted Answer

Ionisation energy increases along a period from left to right and decreases down a group. The position of given elements in the periodic table is as

Group No. 2	16	18
Ca	S	Ar
Ba	Se

Thus, the order of increasing

Δ H_{I E_{1}}

is

B a < C a < S e < S < A r

Q. Which of the following represents the correct order of increasing first ionisation enthalpy for $C a, B a, S, S e$ and $A r$ ?

$C a < S < B a < S e < A r$

$S < S e < C a < B a < A r$

$B a < C a < S e < S < A r$

$C a < B a < S < S e < A r$

Ionisation energy increases along a period from left to right and decreases down a group. The position of given elements in the periodic table is as

Group No. 2 16 18

Ca S Ar

Ba Se

Thus, the order of increasing $Δ H_{I E_{1}}$ is
$B a < C a < S e < S < A r$

Q. 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