What is the electronic configuration of element 63 (europium)?

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A [Xe]6s2 4f2
B [Rn]7s2 5f7
C [Xe]6s2 4f7
D [Xe]6s2 7f9

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Answer: C. [Xe]6s2 4f7

Europium is a lanthanide. Lanthanides have the configuration [Xe] 6s2 4f^n, and europium is the 7th lanthanide, so its configuration is [Xe] 6s2 4f7.

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What is the electronic configuration of element 63 (europium)?

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