Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) Physical and Chemical Properties of Group 13th Elements Single Correct MCQ
Published on: August 13, 2026

The reason behind the lower atomic radius ofj Ga as compared to Al is.

A
Poor screening effect of d – electrons for the outer electrons from increased nuclear charge.
B
Increased formce of attraction ofj increased nuclear charge on electrons
C
Increased ionisation enthalpy of Ga as compared to Al
D
Anomalous behaviour of Ga.

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The correct answer is:
A

Presence of 10 d – electrons in gallium which have poor screening effect on the outer electrons increases the force of attraction between the outermost electrons and nuclear charge resulting in decrease in atomic radius.

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