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Per NCERT §3.7.1(a), the TREND of atomic radius across a PERIOD (left to right) and DOWN a group is which?
ADECREASES across a period (rising Z_eff); INCREASES down a group (new shell + shielding)
BIncreases both ways
CDecreases both ways
DIncreases across a period; decreases down
Answer & Solution
Correct answer: A. DECREASES across a period (rising Z_eff); INCREASES down a group (new shell + shielding)
Per NCERT §3.7.1(a), across a period Z_eff dominates → r shrinks. Down a group new shells dominate → r grows.
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