- Obviously, Alkali metals are metals.
- They react by loosing 1 electron from their outershell to make a full outershell.
Na - 1 electron → Na+
2,8,1 → 2,8
- As you go down the group, the outershell is further away from the nucleus meaning the electron is lost more easily.
- This is why reactivity increases as you go down the group.
- They are called Alkali metals because when they react with water a hydroxide is made (colourless alkaline solouton).
- To test for the hydroxide, you test for hydrogen. This is the test when you place a lighted splint into the gas and it will burn with a speaky pop.
Sodium + Water → Sodium hydroxide + Hydrogen
2Na + 2H2O → 2NaOH + H2
Lithium + Water → Lithium…