Which pair of elements demonstrates a classic diagonal relationship in the periodic table?
Answer and explanation
Correct answer: D. Lithium and Magnesium
- Step 1: Elements in Period 2 resemble elements in Period 3 diagonally to their right due to similar ionic charge-to-radius ratios (polarizing power). Step 2. Classic pairs are Li-Mg, Be-Al, and B-Si. Answer: Lithium and Magnesium. Why not the others: Li-Na are in the same group; Be-Ca are in the same group; B-C are adjacent in the same period.
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