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How to find atomic number?

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Calculate the number of neutrons. Now you know that atomic number = number of protons, and mass number = number of protons + number of neutrons. To find the number of neutrons in an element, subtract the atomic number from the mass number. read more

Find the atomic weight. The atomic weight is typically printed below the element name on the periodic table, usually to two or three decimal places. This is the average mass of one atom of the element, weighted to what you would expect to find in nature. This number is in "atomic mass units" (AMU). read more

The number of protons in the nucleus of an atom determines an element's atomic number. In other words, each element has a unique number that identifies how many protons are in one atom of that element. read more

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