Alkali Earth metals do not have a set number of valence electrons. Hence, option B is correct.
What are alkali metals?
Alkali metals are metals of group 1. These metals are known to react with water to form the corresponding alkali and liberate hydrogen gas.
In alkaline earth, metals have two valence electrons which mean there are two free electrons in the outer shell of alkaline earth metals which are free to interact.
Hence, option B is correct.
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