atom - smallest unit of matter, orbital - most probable location of electron, excited state - atom or ion that has absorbed energy, bright line spectrum - "fingerprint" of elements, proton - positively charged subatomic particle, neutron - subatomic particle in nucleus with no charge, electron - negatively charged subatomic particle, isotope - atoms of the same element with different numbers of neutrons, ion - number of protons and electrons are not equal, atomic number - number of protons, mass number - sum of number of protons and neutrons, average atomic mass - weighted average of the atomic masses for all naturally occurring isotopes of an element, ground state - lowest energy for an atom, energy level - locations for electrons outside the nucleus, electron confuguration - depiction of arrangement of electrons in each energy level, Bohr model - ring structure that shows all electrons in an atom or ion, Lewis structure - depiction of valence electrons in an atom or ion, valence electrons - outermost electrons, cation - positively charged ion, anion - negatively charged ion,

Topic 2 - Part 1: Atomic Structure Vocabulary

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