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In fact, hydrogen (which is a gas at room temperature) is not included in the alkali metals, even though it is located in Group 1 on the periodic table. For the metals in this group, the melting and boiling temperatures decrease with increasing atomic number.
but Iodine is solid at room temp. In group 7 the boiling point increase down the group. In group 1 and 2 the melting and boiling point decrease down the group. IN group 1 and 2 the metal become more reactive down the group and are more readily to give up their electrons to non-metals. It is seen that more reactive metal have lower melting and boiling points. Opposite of Halogens.