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The correct order of increasing radii of the elements`Si,Al,Na and P` is

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The correct order of increasing radii of the elements`Si,Al,Na and P` is
A. `Si, Al, P, Na`
B. `P, Si, Al, Na`
C. `Al, Si, P, Na`
D. `Al, P, Si, Na`
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Correct Answer - B
Due to half-filled orbitals in `P` so that radius of `P` small than `Si`
`P, Si, Al, Na`.
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