- Group 1 elements are soft metal and can be cut with a knife
- Silvery grey surface
- Low density compared to other metals
- Lower melting and boiling points than most other metals
As the atomic radius increases, the charges are further apart and the electrical attractive force is reduced. This results a weaker metallic bond and little heat energy is needed to overcome the bond. Thus, the melting/boiling point decreases as we go down the group.