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Per NCERT §3.7.2(b) (anomalous), the DIAGONAL RELATIONSHIP refers to similarity between which pairs of period-2 / period-3 elements?
ALi ↔ Na; Be ↔ Mg
BLi ↔ Mg; Be ↔ Al; B ↔ Si — first member of a group resembles the second member of the next group
CH ↔ He
DNa ↔ K
Answer & Solution
Correct answer: B. Li ↔ Mg; Be ↔ Al; B ↔ Si — first member of a group resembles the second member of the next group
Per NCERT §3.7.2(b), small size + high charge/radius ratio of Li/Be/B make them resemble Mg/Al/Si — diagonal relationship.
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