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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.
Periodicity is best defined as: the fact that elements increase in atomic mass in a regular way. the repeating nature of physical and chemical properties with increasing atomic number. the regular growth of atomic size with atomic mass. the consistent decrease of nuclear charge with atomic mass.