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Which pair shows the diagonal relationship in the periodic table?
ALi and Mg
BNa and K
CO and S
DF and Cl
Answer & Solution
Correct answer: A. Li and Mg
1. Diagonal relationship pairs elements diagonally across the table.
2. Such pairs share similar properties despite being in different groups.
3. Lithium (Group 1, period 2) and magnesium (Group 2, period 3) are a classic example.
4. They form similar compounds (e.g. Li3N and Mg3N2).
5. Na-K and F-Cl are same-group pairs, not diagonal.
6. So Li and Mg is the diagonal pair.
_Source: NCERT Class 10 Science Ch 5 'Periodic Classification of Elements'_
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