Group 1, 7, 0
Alkali metals:
One electron in the outer shell, very reactive
Soft
Low density
As you go down reactivity increases, boiling point & melting point drecrease
When reacting with water they react vigorously to produce hydrogen gas and metal hydroxides
When reacting with chlorine they react vigorously and form white metal chloride salts
Reaction with oxygen forms metal oxide,
Group one is more reactive than transition metals.
Halogens:
All non metals with coloured vapours
As you go down reactivity decreases, melting and boiling point increases
For 1- ions called halides when they bind with metals.
More reactive halogens displace less reactive ones in their compounds
Noble gases:
8 electrons in outer shell which means they have a full outer shell
Colourless at room temperature
Non flammable
Boiling point and melting points increase as you go down