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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.
Trends in Melting Point and Boiling Point You will see that both melting points and boiling points rise as you go down the Group. If you explore the graphs, you will find that fluorine and chlorine are gases at room temperature, bromine is a liquid and iodine a solid. Nothing very surprising there! Explaining the trends in melting point and boiling point. All of the halogens exist as diatomic molecules-F 2, Cl 2, and so on.