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Question Number 23215 by Tinkutara last updated on 27/Oct/17

$$\mathbf{Assertion}:\mathrm{The}\mathrm{element}\mathrm{with}\mathrm{electronic}$$$$\mathrm{configuration}{\left[\mathrm{Xe}\right]}^{54}4f^{1}5d^{1}6s^2\mathrm{is}\mathrm{a}d-$$$$\mathrm{block}\mathrm{element}.$$$$\mathbf{Reason}:\mathrm{The}\mathrm{last}\mathrm{electron}\mathrm{enters}\mathrm{the}d-$$$$\mathrm{orbital}.$$

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