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Q.
The number of $f$-electrons in $Ho ^{2+}$ ion is_____ . [At. no. of $Ho =67$ ]
The d-and f-Block Elements
Solution:
Electronic configuration of $Ho$ is:
$ {[ Xe ] 4 f ^{11} 6 s ^{2} . } $
$\therefore Ho ^{2+} $ ion $ \Rightarrow[ Xe ] 4 f ^{11}$
$\therefore $ No. of f-electrons$=11$