Proton - Subatomic particle that is postively charged and weighs 1 amu, Neutron - Subatomic particle that is neutral and weighs 1 amu, Electron - Subatomic particle that is negatively charged with a negligible weight, Isotopes - Defined as atoms of the same element with a different number of neutrons, Electron Configuration - The arrangement of electrons in energy levels within an atom,

Atomic Structure

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