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Group I alkali metals trends and properties
Density decreases down the group.
Melting and boiling points decrease down the group.
Reactivity increases down the group.
Melting and boiling points decrease down the group.
Reactivity increases down the group.
Group VII halogens trends and properties
The colour of the halogens become darker down the group.
The melting and boiling points increase down the group. (*contrast this with group I alkali metals)
The reactivity decreases down the group. (*contrast this with group I alkali metals)
A more reactive element in group VII displaces another less reactive element in group VII from its compound.
E.g. Fluorine displaces chlorine from aqueous sodium chloride. F2 + 2NaCl → 2NaF + Cl2
The melting and boiling points increase down the group. (*contrast this with group I alkali metals)
The reactivity decreases down the group. (*contrast this with group I alkali metals)
A more reactive element in group VII displaces another less reactive element in group VII from its compound.
E.g. Fluorine displaces chlorine from aqueous sodium chloride. F2 + 2NaCl → 2NaF + Cl2