what is atomic and mass number

Chemistry · Middle School · Tue Nov 03 2020

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Atomic Number: Atoms of each element contain a characteristic number of protons. The number of protons determines what atom we are looking at (e.g., all atoms with six protons are carbon atoms); the number of protons in an atom is called the atomic number.

Atomic Mass: The number of protons and neutrons combined to give us the mass number of an atom.

mass number = protons + neutrons.