MCQ
Which of the following atomic species has maximum ionisation energy?
- A$O^-$
- ✓$S^-$
- C$Se^-$
- D$Te^-$
✓
Answer
Correct option: B.
$S^-$
b
In the periodic table the ionization energy decreases along a group from top to bottom, but for oxygen the axion feel more repultion in $2 p$-orbital than the $e^{-1}$ present in $3 p$ orbital of sulphur anion, so it becomes easy to remove an electron from the outer most shell of oxygen. Therefore $S$ - has maximum ionization energy.
In the periodic table the ionization energy decreases along a group from top to bottom, but for oxygen the axion feel more repultion in $2 p$-orbital than the $e^{-1}$ present in $3 p$ orbital of sulphur anion, so it becomes easy to remove an electron from the outer most shell of oxygen. Therefore $S$ - has maximum ionization energy.
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