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20 Cards in this Set
- Front
- Back
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Atom
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The basic particle from which all elements are made
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Electrons
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A negatively charged particle that is found outside the nucleus of an atom
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Nucleus
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The central core of an atom
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Proton
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A positively charged particle that is part of an atoms nucleus
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Energy level
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The specific amount of energy an electron has
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Neutron
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A small particle in the nucleus of the atom, with no electrical charge
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Atomic number
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The number of protons in the nucleus of an atom
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Isotopes
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An atom with the same number of protons and a different number of neutrons from other atoms of the same element
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Mass number
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The sum of protons and neutrons in the nucleus of an atom
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Atomic mass number
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The average mass of all the isotopes of an element
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Periodic table
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A chart of elements in the periodic table
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Periods
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A horizontal row of elements in the periodic table
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Groups
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Elements in the same vertical column of the periodic table; also called a family
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Chemical symbol
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A one or two letter representation of an element
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Ion
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An atom or group of atoms that has become electrically charged
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Reactivity
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The ease and speed with which an element combines, or eacts, with other elements and compounds
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Metal
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A class of elements characterized by physical properties that include malleability, shininess, ductility, and conductivity
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Non metal
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An element that lacks nost of the properties of metal
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Metalloid
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An element that has some characteristics of both metals and nonmetals
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Radioactivity
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The spontaneous emission of radiation by an unstable atomic number
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