Which of the following alkali metals is smallest in size?

The lattice energy (numerical value) of alkali metal chlorides is in the order:

Which of the following is the strongest reducing agent?

When $Mg$ burns in air,it produces

Identify the alkali metal having the smallest atomic size from the following.

Among the hydroxides and carbonates of $IA$ and $IIA$ group elements respectively,on moving down the group,the correct solubility order is: