What does the atomic number tell you?
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August 4, 2020What does the atomic number tell you?
The atomic number is the number of protons of an atom and with other information can be used to determine the number of electrons and the number of neutrons in an atom.
Oxygen for example has the atomic number 8. Therefore an oxygen atom has 8 protons in its nucleus. A charge-neutral oxygen atom would also have 8 electrons in its energy shells.
The is the number of protons plus the number of neutrons in an element thus the atomic number can help us determine the atomic mass or the number of neutrons in an element.
For example in the image below if we know the mass number (atomic mass )is 74 and we know the atomic number/number of protons in the element we can solve for the number of neutrons. 74-32=neutrons
