STANDARDChemistry-P Block
STANDARD Chemistry Atomic Radius MCQ Question
Type: MCQ-conceptual-Medium
The reason behind the lower atomic radius of Ga as compared to Al is
A
poor screening effect of d-electrons for the outer electrons from increased nuclear charge
B
increased force of attraction of increased nuclear charge on electrons
C
increased ionisation enthalpy of Ga as compared to Al
D
anomalous behaviour of Ga.
Correct Answer
Option A
Detailed Explanation
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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