Nucleus - Positively charged core of the atom, Electron Cloud - location of electrons within energy levels , Proton - positive charge, mass of 1 - proton and neutron, proton and neutron - located in the nucleus, changes with different isotopes of an atom - mass number, neutron - has no charge, symbol of particle which identifies the atom - p+, symbol of particle which has a mass of 1 amu and no charge - n 0, symbol of particle which is not in the nucleus - e -, ion - an atom that has lost or gained electrons, isotope - atoms which have different mass numbers but have the same atomic number, average atomic mass - the isotopic masses multiplied by their relative abundances and added together, symbol notation - has mass number, atomic number and charge surrounding element symbol, hyphen notation - The element symbol followed by the mass number, 26 - the atomic number of iron, 30 - the number of neutrons in iron-56,

Subatomic Particles

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