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What does the small number 2 show in this chemical formula H2O?

A) There are 2 oxygen atoms.

B) There are 2 water molecules.

C) There is half of a hydrogen atom.

D) There are 2 hydrogen atoms

Respuesta :

Explanation:

option D there are 2 hydrogen atoms

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Answer:

D there are two hydrogen atoms

Explanation:

because when the formula is written out its H2 O but when combine its H20