The number of elements present in a water molecule are ______.

three

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two

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four

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one

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Solution

The correct option is B
two

The chemical formula of water is $H_{2} O$ . The number of elements is two which are hydrogen (H) and oxygen (O). But if we see the number of atoms then there are 3 atoms i.e. 2 atoms of hydrogen and 1 atom of oxygen.

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