A hydrogen atom is denoted by the letter "H". Any number of hydrogen atoms will also be denoted by the same symbol, since all of them are identical. Hydrogen gas has molecules, each of which is made up of 2 hydrogen atoms and has a molecular formula of `H_2` . The question mentions chemical formula for 8 hydrogen atoms. As already mentioned all atoms of the same element are identical (assuming the same isotope) and hence 8 hydrogen atoms will be denoted as H. `H_2` is a molecule and not an atom and hence `4H_2` is not the right option. 8 hydrogen atoms will not even combine together to form `H_8` , unlike carbon, whose atoms are capable of forming long chains (due to catenation).
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