Answer:
here the first Term that is in use is Alkali .
simply water soluble bases are called alkali.
and element in group two are alkaline earth metal .
:the reason is
whenever they release oxide that oxides remain in the crust of the earth and are very heat-stable( can bear a lot of heat). so it can be called as alkalin earth metal.
hope this point helped u☺️
any confusion then comment it.