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(B) $i$. Atomic radii: $Cl$ $(1.81 \ \mathring{A})$,$F$ $(0.72 \ \mathring{A})$,$Li$ $(1.52 \ \mathring{A})$. The correct order is $Cl > Li > F$

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$ii, iv$ only

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(B) $i$. Atomic radii: $Cl$ $(1.81 \ \mathring{A})$,$F$ $(0.72 \ \mathring{A})$,$Li$ $(1.52 \ \mathring{A})$. The correct order is $Cl > Li > F$. Thus,$i$ is incorrect.
$ii$. Atomic radii: $P$ $(1.28 \ \mathring{A})$,$C$ $(0.77 \ \mathring{A})$,$N$ $(0.75 \ \mathring{A})$. The order $P > C > N$ is correct.
$iii$. Lanthanoid contraction: $Eu$ $(2.04 \ \mathring{A})$,$Sm$ $(1.98 \ \mathring{A})$,$Tm$ $(1.74 \ \mathring{A})$. The correct order is $Eu > Sm > Tm$. Thus,$iii$ is incorrect.
$iv$. Atomic radii: $Sr$ $(2.15 \ \mathring{A})$,$Ca$ $(1.97 \ \mathring{A})$,$Mg$ $(1.60 \ \mathring{A})$. The order $Sr > Ca > Mg$ is correct.
Therefore,$ii$ and $iv$ are correct.

Identify the correct orders regarding atomic radii:
$i$. $Cl > F > Li$
$ii$. $P > C > N$
$iii$. $Tm > Sm > Eu$
$iv$. $Sr > Ca > Mg$

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Identify the correct orders regarding atomic radii: $i$. $Cl > F > Li$ $ii$. $P > C > N$ $iii$. $Tm > Sm > Eu$ $iv$. $Sr > Ca > Mg$