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Question

Question: Which of the following lanthanide ion is paramagnetic?...

Which of the following lanthanide ion is paramagnetic?

A

Ce4+Ce^{4 +}

B

Yb2+Yb^{2 +}

C

Lu3+Lu^{3 +}

D

Eu2+Eu^{2 +}

Answer

Eu2+Eu^{2 +}

Explanation

Solution

Ce[Xe]4f15d16s2;Ce \rightarrow \lbrack Xe\rbrack 4f^{1}5d^{1}6s^{2}; Ce4+[Xe]Ce^{4 +} \rightarrow \lbrack Xe\rbrack

Yb[Xe]4f146s2;Yb \rightarrow \lbrack Xe\rbrack 4f^{14}6s^{2}; Yb2+[Xe]4f14Yb^{2 +} \rightarrow \lbrack Xe\rbrack 4f^{14}

Lu[Xe]4f145d16s2Lu \rightarrow \lbrack Xe\rbrack 4f^{14}5d^{1}6s^{2}; Lu3+[Xe]4f14Eu[Xe]4f76s2;Lu^{3 +} \rightarrow \lbrack Xe\rbrack 4f^{14}Eu \rightarrow \lbrack Xe\rbrack 4f^{7}6s^{2}; Eu2+[Xe]4f7Eu^{2 +} \rightarrow \lbrack Xe\rbrack 4f^{7}