Proton and Neutron mass - 1 atomic mass unit, Neutron Charge - Neutral, Electron Charge - Negative, Atomic Number - Number of protons, Mass Number - Protons + neutrons, Isotope - Same protons, different neutrons, Proton Charge - Positive, Electron mass - 1/1840 atomic mass unit, located in energy levels around nucleus - electrons, same element - same protons, similar chemical properties - same amount of outer electrons,

A-Level Chemistry: Atomic Structure

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