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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.
This explanation is from my teacher: 1  Let's take two alkali metals; lithium and sodium. 2  First, you need to know that the melting point of a substance is determined by the force of attraction between the nuclei of the atoms in a substance. The stronger of force of attraction between the nuclei of atoms in a substance, the higher the melting point of the substance.