Mass Charge Proton 1 +1 Electron negligable - 1 Neutron 1 0
Mass Number = protons + neutrons Atomic Number = number of protons
Protons and Neutrons are contained in the nucleus whilst Electrons are contained in shells around the nucleus
Isotopes are atoms with the same atomic number but a different mass number
Ar = average mass of 1 mole of an element 1/2th mass of an atom of carbon 12
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