The correct order of density of alkali metal follows the order

The densities are $\mathrm{Li} \left(0.54\mathrm{g}{\mathrm{cm}}^{-3}\right), \mathrm{Na} \left(0.97\mathrm{g}{\mathrm{cm}}^{-3}\right)$ and $\mathrm{K}\left(0.86{\mathrm{gcm}}^{-3}\right)$.

Thus, the correct order of density of alkali metal follows the order,

$\mathrm{Li}<\mathrm{K}<\mathrm{Na}$