Which of the following is/are correct

Hardest alkali metal is softer than the softest alkaline earth metal

In all alkali metal halides (excluding Fr & At) NaF has highest melting point and LiI has lowest  melting point

Correct order of ionic radius of  
 $L{i}^{+}\left(g\right),M{g}^{+2}\left(g\right),B{e}^{+2}\left(g\right),A{l}^{+3}\left(g\right)isL{i}^{+}>M{g}^{+2}>A{l}^{+3}>B{e}^{+2}$

Metallic radius of ‘ K ‘ is greater than that of Sr & Ba