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24 Cards in this Set
- Front
- Back
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Nucleus
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Dense, positively charged mass located in the center of the atom
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Proton
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Positively charged subatomic particle; made of two up and one down quark
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Electron
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Negatively charged subatomic particle
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Neutron
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Subatomic particle with zero charge; made of one up and two down quarks
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quarks
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Subatomic particle theorized to be the most basic unit of matter
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atomic number
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The number of protons in an element’s atom
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mass number
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The sum of protons and neutrons in an element’s atom
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Isotopes
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Atoms of the same element with the same atomic number, but different mass numbers
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energy levels
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The possible energies than an electron can have
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Orbital
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The region of space around the nucleus where an electron is likely to be found
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Electron Cloud
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Visual model of the most likely locations for electrons in an atom
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Period
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Horizontal rows on the periodic table representing the number of available electron shells
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Group
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Vertical columns on the periodic table representing elements with a similar electron configuration
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Periodic Law
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Pattern of repeating properties
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Atomic Mass Unit
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1/12 the mass of a Carbon-12 atom
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Metals
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Elements that are good conductors of electric current and heat
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Transition Metals
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Elements that form a bridge between the elements on the left and right sides of the periodic table
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Nonmetals
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Elements that are poor conductors of heat and electricity
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Metalloids
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Elements with properties that fall between those of metals and nonmetals
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Valence electron
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An electron that is in the highest occupied energy level of an atom
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Alkali metals
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Elements in group 1A
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Alkaline Earth Metals
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Elements in group 2A
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Halogens
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Elements in group 7A
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Noble gases
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Elements in group 8A
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