Which of the statements about the behaviour of the atom is correct?
A.
atomic size decreases down the group
B.
atomic size increases across the period
C.
anions are smaller than the parent atom
D.
cations are smaller than the parent atom
Correct Answer: Option D
Explanation
Cations (positively charged ions) are smaller than their parent atoms because the loss of electrons reduces electron-electron repulsion and increases the effective nuclear charge, pulling the remaining electrons closer to the nucleus.
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