STANDARDChemistry-f-Block Elements
STANDARD Chemistry Lanthanoids and Actinoids MCQ Question
Type: MCQ-conceptual-Medium-Class 12
Identify the incorrect statement among the following.
A
4f and 5f orbitals are equally shielded.
B
d-Block elements show irregular and erratic chemical properties among themselves.
C
La and Lu have partially filled d-orbitals and no other partially filled orbitals.
D
The chemistry of various lanthanoids is very similar.
Correct Answer
Option A
Detailed Explanation
The decrease in the force of attraction exerted by the nucleus on the valence electrons due to presence of electrons in the inner shells is called shielding effect. A 4f orbital is nearer to the nucleus than 5f orbital. Hence shielding of 4f is more than 5%.
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