Discussion
The lanthanoid with the outer electronic configuration 4f75d16s2 is
Answer: D
The lanthanoid is gadolinium (Z = 64).
Gadolinium has the configuration [Xe]4f75d16s2: the extra stability of a half-filled 4f7 subshell makes one electron go into 5d rather than giving 4f8.
Europium (Z = 63) is [Xe]4f76s2, with no 5d electron. Neodymium is 4f46s2, samarium 4f66s2 and holmium 4f116s2.
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