Question

element with two valency are called​

Answer 1

Answer:

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two atoms of hydrogen combine with one atom of oxygen to form water (H2O); so, the valency of oxygen is two. ... In Iron [II] sulfate or ferrous sulfate, i.e., FeSO4, the valency of iron is two. In Iron [III] sulfate or ferric sulfate, i.e., Fe2(SO4)3, the valency of iron is three.

Answer 2

Answer:

Element with two valency are called alkaline earth metals