Gadolinium belongs to 4f series. Its atomic number is 64

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

Options

(a) [Xe] 4f⁹5s¹
(b) [Xe]4f⁷5d¹6s²
(c) [Xe]4f⁶5d²6s²
(d) [Xe]4f⁸6d²

Correct Answer:

[Xe]4f⁷5d¹6s²

Explanation:

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