Lithium, sodium, potassium, rubidium, caesium.
Alkali metals more reactive as you go down the group. Outer electron more easily lost because further away from nucleus so larger atomic radius, less energy needed to remove it.
All have one outer electron making them reactive and similar physical properties.
Low melting and boiling point, low density and very soft (can be cut with knife).
Always form ionic compounds because so keen to lose outer electron.
Keen to lose an electron to form 1+ ion with stable electronic structure. More reactive metal, easier to lose electron. Loss of electrons - oxidation.
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