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atomic number = number of proton in an element

number of proton = number of electron

mass number = number of proton + number of neutron

therefore...

atomic number = mass number - number of neutrons

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14y ago
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11y ago

There is no need for a formula. The atomic number of an element is the same as the number of protons in the atom. e.g. chlorine has the atomic number 17 so its atom has 17 protons.

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Q: What is the formula for atomic number?
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