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Ch. 6 Vocabulary Atom • the smallest unit of an element that still has properties of the element Proton • a subatomic particle with a positive charge that is found in the nucleus of an atom Neutron • a subatomic particle that has no charge and is found in the nucleus of an atom Electron • a subatomic particle that has a negative charge Nucleus • the dense positively charged center of the atom where protons and neutrons are located Electron Cloud • a region around the nucleus of an atom where electrons are likely to be found Atomic Number • The number of protons in the nucleus of an atom Atomic Mass • the weighted average of all of the naturally occurring isotopes of the element Mass Number • the sum of the number of protons and neutrons in the nucleus of an atom Isotopes • atoms of the same element that have the same number of protons but a different number of neutrons