Atoms are made up of 3 sub-atomic particles. The protons and neutrons are found in the nucleus of the atom and the electrons orbit the nucleus within electron shells.
ATOMIC PARTICLE RELATIVE MASS RELATIVE CHARGE
Proton 2000 +1
Neutron 2000 0
Electron 1 -1
The atom is neutrally charged as there are the same number of protons as there are electrons.
To find out how many protons or electrons are in an atom, you find out the atomic number of the element. To find out how many neutrons are in an atom, you subtract the atomic number of the element from the atomic mass number.
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