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Q.

Identify the correct statement

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a

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

b

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

c

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

d

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

answer is B.

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Detailed Solution

Filling of 4f-orbitals starts with 58th  element ,cerium
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