Number of electrons present in $4 f$ orbital of $Ho ^{3+}$ ion is________ . (Given atomic number of $Ho =67)$ [JEE Main 2021, 25 Jul (Shift 2)]

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Number of electrons present in \(4 f\) orbital of \(Ho ^{3+}\) ion is________ . (Given atomic number of \(Ho =67)\) [JEE…