Order or trend of atomic radii for a set of elements

1. A.
   $Mg > Al > C > O$
2. B.
   $Al > B > N > F$
3. C.
   $Be > Mg > Al > Si$
4. D.
   $Si > P > Cl > F$

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1. A.
   $r_{Br} < r_{K}$
2. B.
   $r_{Mg} < r_{Al}$
3. C.
   $r_{Rb} < r_{Cs}$
4. D.
   $r_{At} < r_{Cs}$

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1. A.
   $Na\& Cl$
2. B.
   $K\& Se$
3. C.
   $K\& Br$
4. D.
   $Rb\& Br$

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