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17-09-2016
Chemistry

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how do we calculate the number of protons, electrons and neutrons in an element?

Respuesta :

mereiland mereiland

18-09-2016

The atomic number of an element is equal to the number of protons. It the element has a neutral charge then the number of protons equals the number of electrons. The number of neutrons equals the atomic mass minus the atomic number.

ex:
Sodium
Atomic number: 11
Atomic mass: 23

Protons: 11
Electrons: 11
Neutrons: 23 - 11 = 12

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