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How is the mass number of an atom determined?

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Atomic mass is the mass of an atom, particle, or molecule. The atomic mass is determined by the number of protons and neutrons in the atom. For example, Oxygen has 8 protons (as seen by the atomic number) and 8 neutrons which gives oxygen an atomic mass of 16. read more

Atomic mass = Number of protons + number of neutrons + number of electrons For example: Question 1: The atomic number of an element is 17 and the number of neutrons in its atom is 18. read more

AMU is defined as 1/12th of the mass of a carbon-12 atom. This is the isotope chosen to be used as a reference standard to compare atomic mass among atoms. read more

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