A) increase in number of electrons
B) increase in number of protons and neutrons
C) increase in number of protons
D) increase in number of protons, neutrons and electrons
Correct Answer: A
Solution :
Key Idea In a given group, atomic size increases due to addition of extra shell which outweighs the effect of increased nuclear charge. Number of shells increases with addition of extra electrons. Hence, increase in atomic size down the group is due to increase in number of electrons.
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