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Cathode Ray - Experiment that showed that all atoms contain tiny negatively charged subatomic particles or electrons, Oil drop - Experiment that showed that the charge of an electron is -1.60E-19, Plum Pudding - Model that showed that atoms as solid positively charged spheres with negatively charged electrons scattered throughout., Gold Foil - Experiment that disproved the Plum-Pudding Model; Showed that the atom has a small, dense nucleus surrounded by an electron "cloud", Proton - ubatomic particle located in the nucleus that contains a POSITIVE charge, Neutron - Subatomic particle located in the nucleus that containsNO CHARGE, Electron - A negatively charged, low-mass particle present within all atoms., Mass Number - The sum of the number of protons and neutrons in an atom., Atomic Number - The number of protons in an atom; this value defines the element, Cation - Positively charged ion, Anion - Negatively charged ion, Metals - Elements that lie on the lower left side and middle of the periodic table, Nonmetals - Elements that lie on the upper right side of the periodic table., Metalloids - Elements that lie along the zigzag diagonal line that divides metals and nonmetals, Molecular Elements - Elements that do not normally exist in nature with single atoms as their basic units; Also known as diatomic elements,

Hawker - Periodic Table Key Terms

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