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What determines the number of neutrons in an atom?

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In a sense what determines the number of neutrons in an atom is time. As Steve Harris points out in his very good answer, the stability of an atom is determined by the number of neutrons compared to the number of protons. read more

How to Find the Number of Neutrons in an Atom Two Methods: Finding the Number of Neutrons in a Regular Atom Finding the Number of Neutrons in an Isotope Community Q&A Determining the number of neutrons in an atom is fairly simple and doesn’t even require any experimentation. read more

2 or more atoms of the same element which have different numbers of neutrons. Carbon 12, the most common form of carbon, has six protons and six neutrons, whereas carbon 14 has six protons and eight neutrons. read more

Each atom has an integer number of neutrons, but the periodic table gives a decimal value because it is a weighted average of the number of neutrons in the isotopes of each element. So, what you need to do is round the atomic weight to the nearest whole number to get a mass number for your calculations. read more

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