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In 6^th period filling of electron in 5d orbital begins with the element

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answer is B.

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Detailed Solution

Atomic number of Lu is 71 and its electronic configuration is [Xe] 4f¹⁴ 5d¹ 6s².

Atomic number of La is 57 and its electronic configuration is [Xe] 5d¹ 6s².

Atomic number of Hf is 72 and its electronic configuration is [Xe] 4f¹⁴ 5d² 6s².

Atomic number of Hg is 80 and its electronic configuration is [Xe] 4f¹⁴ 5d¹⁰ 6s².

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