Alkali Metals

Halogens

Physical Properties

🔵 Silver colored metals
🔵 Soft
🔵 Have low melting and boiling points
🔵 Low densities (Li, Na, K are less dense than water)
🔵 Weak metallic boding because there is only one electron available from each

🔵 They are coloured.
🔵They exist as diatomic molecules.
🔵Melting points increase as you go down group 7.
🔵The reactivity decreases as you go down group 7.