What is chemical formula of water ? how it is composed​

H2O

Explanation:

it is composed of 2 atoms of Hidro and 1 atom Oxy

The chemical formula for water is H2O..it is composed by the bonding of 2 molecules of hydrogen and one molecule of oxygen,a covalent bond to be specific.

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it's c. elements are placed in rows based on how may valencies electrons have.