Ranking By Radius Size

Lithium ($Li$)

Beryllium ($Be$)

Sodium ($Na$)

Potassium ($K$)

Sodium ($Na$)

Chlorine ($Cl$)

They are the same size

Not enough information

Barium ($Ba$), Calcium ($Ca$)

Oxygen ($O$), Nitrogen ($N$)

Fluorine ($F$), Neon ($Ne$)

Chlorine ($Cl$), Argon ($Ar$)

Magnesium ($Mg$)

Strontium ($Sr$)

They are the same size

Not enough information

Boron ($B$)

Carbon ($C$)

Nitrogen ($N$)

Fluorine ($F$)

Group 1 (Alkali metals)

Group 2 (Alkaline earth metals)

Group 17 (Halogens)

Group 18 (Noble gases)

Sodium ion ($Na^{+}$)

Chloride ion ($Cl^{-}$)

Potassium ion ($K^{+}$)

Calcium ion ($Ca^{2+}$)

Increases

Decreases

Remains the same

Increases then decreases

Lithium ($Li$) and Francium ($Fr$)

Sodium ($Na$) and Magnesium ($Mg$)

Boron ($B$) and Carbon ($C$)

Oxygen ($O$) and Fluorine ($F$)

$Na^{+}$

$Mg^{2+}$

They have the same radius

Not enough information