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Per NCERT §3.7.1(c), the GENERAL trend of first ionisation enthalpy across a period and down a group is which?
ADecreases across, increases down
BDecreases both ways
CIncreases both ways
DIncreases across a period (rising Z_eff > shielding); decreases down a group (more shells + shielding dominate)
Answer & Solution
Correct answer: D. Increases across a period (rising Z_eff > shielding); decreases down a group (more shells + shielding dominate)
Per NCERT §3.7.1(c), IE: increases L→R across period, decreases top→bottom down group. Some anomalies (B<Be, O<N).
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