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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