High Quality Content by WIKIPEDIA articles! Sodium-23 is isotope of sodium. Isotopes are different types of atoms of the same chemical element, each having a different number of neutrons. In a corresponding manner, isotopes differ in mass number but never in atomic number. The number of protons is the same because that is what characterizes a chemical element. For example, carbon-12, carbon-13 and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13 and 14, respectively. The atomic number of carbon is 6, so the neutron numbers in these isotopes of carbon are therefore 12?6 = 6, 13?6 = 7, and 14–6 = 8, respectively.

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