Question

the family of metals having valency 2

Answer 1

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here is your answer
the family of metal having valency 2 are Alkaline earth metals

Answer 2

Alkaline earth metals have valence two.

In the periodic table, group 2 elements are called as alkaline earth metals.

The following elements are present in the group 2.

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If we observe, all these elements have two electrons in their outer shell electronic configuration.

Therefore, all these metals have two valence.

Alkali earth metals are readily reacts with water , nitrogen and halogens to form their respective hydroxide, nitrides and halides.