Identify the incorrect statement in the following - Vidyadip

MCQ

Identify the incorrect statement in the following

A
$d$ block element show irregular and erratic chemical properties among themselves.
B
$La$ and $Lu$ have partially filled $d-$ orbital and no other partially filled orbital
C
The chemistry of various Lanthanoids are similar
✓
$4f$ and $5f$ orbitals are equally shielded.

✓

Answer

Correct option: D.

$4f$ and $5f$ orbitals are equally shielded.

d
$4 f$ and $5 f$ orbitals are not equally shielded.$5$ are poorly shielded as $5 f$ orbitals are away from the nucleus.Also,$5$ has poor shielding effect than $4 f$ due to the large size of $f$-orbital, it is more diffused.

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