Why Alkali metals are soft and have low melting point?

1. Alkali metals are the elements belonging to Group 1 of the periodic table.
2. The general electronic configuration of alkali metals are $\left[\mathrm{Noble}\mathrm{gas}\right]n{s}^1$ where n is the valence shell.
3. When Alkali metals are reacted with water they form strong bases.
4. Alkali metals are electropositive and very reactive.
5. Alkali metals have large atomic radii between neighboring atoms of group 1 and show a weaker force of attraction due to which they are generally soft and thus have a low melting point.