JEE MAIN - Chemistry (2013 (Offline) - No. 22)
Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se
and Ar?
S < Se < Ca < Ba < Ar
Ba < Ca < Se < S < Ar
Ca < Ba < S < Se < Ar
Ca < S < Ba < Se < Ar
Explanation
Those elements are present in periodic table like this -
In periodic table,
1. From left to right ionization energy increases.
2. From top to bottom ionization energy decreases.
$$ \therefore $$ Ba < Ca and Se < S and S < Ar
$$ \therefore $$ Correct order is -
Ba < Ca < Se < S < Ar
| Group 2 | Group 16 | Group 18 | |||
|---|---|---|---|---|---|
| Period 3 | Ca | .......... | S | ......... | Ar |
| Period 4 | Se | ||||
| Period 5 | Ba |
In periodic table,
1. From left to right ionization energy increases.
2. From top to bottom ionization energy decreases.
$$ \therefore $$ Ba < Ca and Se < S and S < Ar
$$ \therefore $$ Correct order is -
Ba < Ca < Se < S < Ar
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