If you want to refer to a certain isotope - you write it like this: AXZ. Here X is the chemical symbol for the element - Z is the atomic number - and A is the number of neutrons and protons combined - called the mass number. For instance - ordinary h

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1. If you want to refer to a certain isotope - you write it like this: AXZ. Here X is the chemical symbol for the element - Z is the atomic number - and A is the number of neutrons and protons combined - called the mass number. For instance - ordinary h