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i think there are 3 elements hydrogen; sulfur; and oxygen
4. There are two Hg's and two Cls.
The subscripted number following an element tells you how many atoms of that element are in that molecule. H2SO4 -> (2) hydrogen atoms, (1) sulfur atom, and (4) oxygen atoms.
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ONE, Helium is an element, not a molecule.
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There are 5 elements: carbon, hydrogen, oxygen, nitrogen, and phosphorus.