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Identify the incorrect statement among the following:

1. 4f and 5f orbitals are equally shielded.
2. d-Block elements show irregular and erratic chemical properties among themselves.
3. La and Lu have partially filled d-orbitals and no partially filled f-orbitals.
4. The chemistry of various lanthanoids is very similar.

Correct answer: 4f and 5f orbitals are equally shielded.

Solution

The incorrect statement is that 4f and 5f orbitals are equally shielded: 5f electrons are more diffuse and poorly shielded compared with 4f. The other statements are correct - La (5d^1, f^0) and Lu (5d^1, f^14) both have a partially filled d-orbital and no partially filled f-orbital, lanthanoid chemistry is very similar, and d-block elements show irregular properties.

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