MCQ
Which of the following has maximum first ionisation energy ?
- ✓$Pd$ (atomic no. $= 46$)
- B$Ag$ (atomic no. $= 47$)
- C$Rb$ (atomic no. $= 37$)
- D$Y$ (atomic no. $= 39$)
✓
Answer
Correct option: A.
$Pd$ (atomic no. $= 46$)
a
$\mathrm{Pd}(46):[\mathrm{Kr}] \,5 \mathrm{s}^{0} 4 \mathrm{d}^{10}$
$\mathrm{Pd}(46):[\mathrm{Kr}] \,5 \mathrm{s}^{0} 4 \mathrm{d}^{10}$
$\mathrm{Ag}(47):[\mathrm{Kr}] \,5 \mathrm{s}^{1} 4 \mathrm{d}^{10}$
$\mathrm{Rb}(37):|\mathrm{Kr}| \,5 \mathrm{s}^{1}$
$\mathrm{Y}(39):[\mathrm{Kr}] \,5 \mathrm{s}^{2} 4 \mathrm{d}^{1}$
removal of electron is most. difficult from $d^{10}$.
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