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  4. Number of electrons present in 4f orbital of Ho 3+ ion is. (Given Atomic No. of Ho =67 )

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Q. Number of electrons present in $4f$ orbital of $Ho ^{3+}$ ion is______. (Given Atomic No. of $Ho =67$ )

JEE MainJEE Main 2021The d-and f-Block Elements

Solution:

$H o=[X e] 4 f^{11} 6 s^{2}$
$H o^{3+}=[X e] 4 f^{10}$
so number of $e^-$ present in $4 f$ is $10$