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equal to the number of protons plus the number of neutrons, identifies a specific isotope of an element
a group of 8 valence electrons, very stable, the goal for ion formation and most bonding
a representation of an atom or ion that shows the element symbol, atomic number, mass number, and charge (if present)
a higher energy level that an electron can enter if it absorbs the right amount of energy
bright line spectra
the unique amounts of energy emitted as electrons return to the ground state, specific colors shown as individual bright lines
plum pudding model
the model of the model of the atom created by JJ Thomson, consists of electrons on the surface of a positively charged sphere
solar system model
the model of the atom created by Bohr, consists of electrons orbiting the central nucleus
gold foil experiment
an experiment done by Rutherford, proved that atoms are mostly empty space and have a dense, positive nucleus
cannon ball model
the model of the atom created by Dalton, states that atoms are solid spheres with no internal structure
the model of the atom created by Schrodinger, states that electrons are in orbitals around the central nucleus, sometimes called the electron cloud model
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