In a lot of books I have seen the mass number of an element being written on left superscript of its chemical symbol,while my professor and other teachers write it in right superscript.However, it is written at the bottom of the symbol in the periodic table.Which is/are correct, or are all correct but different ways to represent the same thing?(adsbygoogle = window.adsbygoogle || []).push({});

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# Notation of mass number of an element

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