The incorrect decreasing order of atomic radi | vedclass

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Question

(C) Atomic radius generally decreases across a period from left to right and increases down a group. For option $A$: $Mg$ $(160 	ext{ pm})$ $> Al$ $(

Vedclass · Accepted Answer

$Be > Mg > Al > Si$

Vedclass · Answer

(C) Atomic radius generally decreases across a period from left to right and increases down a group. For option $A$: $Mg$ $(160 	ext{ pm})$ $> Al$ $(143 	ext{ pm})$ $> C$ $(77 	ext{ pm})$ $> O$ $(66 	ext{ pm})$. This is correct. For option $B$: $Al$ $(143 	ext{ pm})$ $> B$ $(88 	ext{ pm})$ $> N$ $(70 	ext{ pm})$ $> F$ $(64 	ext{ pm})$. This is correct. For option $C$: $Be$ $(111 	ext{ pm})$   Al$ $(143 	ext{ pm})$ $> Si$ $(118 	ext{ pm})$. The order $Be > Mg > Al > Si$ is incorrect because $Mg > Be$. For option $D$: $Si$ $(118 	ext{ pm})$ $> P$ $(110 	ext{ pm})$ $> Cl$ $(99 	ext{ pm})$ $> F$ $(64 	ext{ pm})$. This is correct.

The incorrect decreasing order of atomic radii is:

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