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DESCRIPTIVE INORGANIC CHEMISTRY: Halogens (GROUP VII or 17)

The chemical reactivity of halogens down the group is in the order:

An unknown gas that turns damp blue litmus paper red and then bleaches it is:

The colour and physical state of iodine at room temperature is?
As you go down the group from fluorine to iodine, the melting and boiling points of halogens increase due to an increase in the strength of?

The halogens are the ... elements of the periodic table.