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In a chemical formula, no subscript was ...

In a chemical formula, no subscript was written. What does indicate this ?

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1) It there is no subscript in a chemical formula, this means the number of atoms is one.
2) Eg : `Fe,` this means, only one atom in that formula.
3) Eg : `O_(2)`, this meant, two atoms in that formula, subscript is 2.
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