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Question

Gadolinium belongs to 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?

A
[Xe]4f95s1
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B
[Xe]4f75d16s2
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C
[Xe]4f65d26s2
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D
[Xe]4f86d2
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Solution

The correct option is B [Xe]4f75d16s2
You need to recall that Gd has a stable half filled 4f series. It is easy for lanthanides to have electrons jump between 5d, 4f and 6s due to the low energy gap betwen them.

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