Periodic Table
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| the basic particle of which all elements are made; the smallest particle of an element that has the properties of that element. | atom
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| a tiny, negatively charged particle that moves around the outside of the nucleus of an atom. | electrons
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| the central core of an atom which contains protons and neutrons. | nucleus
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| small, positively charged particles that are found in the nucleus of an atom. | protons
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| a region of an atom electrons of the same energy are likely to be found. | energy level
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| a small particle in the nucleus of an atom, no electrical charge. | neutron
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| the number of protons in the nucleus in an atom. | atomic number
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| an atom with the same number of protons an a different number of neutrons form other atoms of the same element. | isotopes
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| the sum of protons and neutrons in the nucleus of an atom. | mass number
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| the number of protons in the nucleus of an atom. | atomic number
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| an arrangement of the elements showing the repeating pattern of their properties. | periodic table
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| a 1 or 2 letter representation of an element. | chemical symbol
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| a horizontal row of elements in the periodic table. | period
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| elements in the same vertical column of the periodic table; also called family. | group
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| a class of elements characterized by physical properties that include luster, malleability, ductility, and conductivity. | metal
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| the way a mineral reflects light from its surface. | luster
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| a term used to describe material that can be hammered or rolled into flat sheets. | malleable
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| a term used to describe a material that can be pulled out into a long wire. | ductile
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| the ability of an object tot transfer heat. | thermal conductivity
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| the ability of an object to carry electric current. | electrical conductivity
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| the ease and speed with which an element combines, or reacts, with other elements and compounds. | reactivity
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| the gradual wearing away of a metal element due to a chemical reaction. | corrosion
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| an element in group 1 in the periodic table. | alkali metal
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| an element in group 2 in the period table. | alkaline earth metal
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| one of the elements in groups 3-12 on the periodic table. | transition metal
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| an element that lacks most of the properties of a metal. | nonmetal
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| a molecule consisting of 2 atoms. | diatomic metal
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| an element found in group 17 on the periodic table. | halogen
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| an element in group 18 of the periodic table. | noble gasses
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| an element that has some characteristics of both metal and nonmetals. | metalloid
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| a substance that can conduct electric current under some conditions. | semiconductor
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| the process in which radioactive elements break down, releasing fast moving particles and energy. | radioactive decay
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| a reaction involving the particles in the nucleus of an atom that can change one element into another. | nuclear reaction
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| the spontaneous emission of radiation by ab unstable atomic nucleus. | radioactivity
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| a particle given off during radioactive decay tat consists of of 2 protons and 2 neutrons. | alpha particle
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| a fast moving electron that is given of as nuclear radiation. | beta particle
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| electromagnetic waves with the shortest wavelengths and highest frequencies. | gamma ray
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| the time it takes for half of the atoms of a radioactive element to decay. | half life
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| the process of determining the age of an object using half life of 1 or more radioactive isotopes. | radioactive dating
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| a radioactive isotope that can be followed through the steps of a chemical reaction or industrial process. | tracer
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