Alkali metals are

There are 18 numbered groups in the periodic table; the 14 f-block columns, between groups 2 and 3, are not numbered.

Group 1: Hydrogen and the Alkali Metals.
Group 2: The Alkaline Earth Metals.
Group 3: Transition Metals.
Group 4: Transition Metals.
Group 5: Transition Metals.
Group 6: Transition Metals.
Group 7: Transition Metals.
Group 8: Transition Metals.