A) $ P $
B) $ Si $
C) $ Al $
D) $ Mg $
Correct Answer: D
| Element - | Mg | Al | Si | P |
|---|---|---|---|---|
| Atomic radii $ ( {\AA} ) $ - | 1.60 | 1.43 | 1.32 | 1.28 |
as we move across the period nuclear charge increases, hence, size decreases.
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