Question

From the formula of water, H2O, work out the valencies of hydrogen and oxygen.

Answer 1

Since, while making the formula of a compound, we interchange the valencies to get how many atoms of a certain element are needed in the compound, we now do the exact opposite.

$H_{2} O$ is 2 H atoms and 1 O atom.

Therefore, by exchanging the subscript, we get the valency

$H^{1+}$$O^{2-}$

Answer 2

H2O is the chemical formula of water. It means that each molecule of water is made up of two hydrogen atoms, indicated by the letter H, and a single oxygen atom, represented by the letter O. Water is chemical substance with no smell, taste or color.