When referring to an atom, we simply use the element’s name: the term sodium refers to the element as well as an atom of sodium. What are the atomic number and the mass number of this isotope? The number of protons in the nucleus of a tin atom is 50, while the number of neutrons in the nucleus is 68. Because the mass number is 235, then the number of neutrons in the nucleus is 235 − 92, or 143.
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