Q.

Identify the correct  statement

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a

Filling of 4f orbital begins with La in 6th period

b

Filling of 4f orbital begins with Ce in 6th period

c

Filling of 5f orbital begins with La in 5th period

d

Filling of 5d orbital begins with Hf in 5th  period

answer is B.

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Detailed Solution

first 4f electron enters Ce after 6s and 5d

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