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Alkali Metals
Have low melting and boiling points.
Are very soft, and can be cut easily.
Have low densities.
Are very reactive.
Reactivity (least to most): Li, Na, K, Rb, Cs, Fr
Are all in Group 1.
All have one electron in their outer shell.
Halogens
Are poor conductors of electricity.
Give off coloured vapours.
Reactivity (least to most): At, I, Br, Cl, F
Are all in Group 7.
All have seven electrons in their outer shell.
Noble Gases
Are very unreactive.
Reactivity (least to most): He, Ne, Ar, Kr, Xe, Rn
Are all in Group 8.
All have eight electrons in their outer shell.
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