science vocab 2.0
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| the statement that the chemical and physical properties of the elements recur periodically when the elements are arranged in the order of their atomic weights. | periodic law
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| In the Periodic Table, any of the seven horizontal rows that contain elements arranged in order of increasing atomic number | period
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| In the Periodic Table, a vertical column that contains elements having the same number of electrons in the outermost shell of their atoms | group
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| an electrically charged atom or group of atoms formed by the loss or gain of one or more electrons | ion
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| an element that is shiny and conducts heat and electricity well | metal
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| element that conducts electricity and heat poorly and doesnt for positive ions | nonmetal
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| an element or compound that conducts electric current better than an insulator does but not as well as a conductor does | semi-conductor
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| an element that has both metallic and nonmetallic properties | metalloid
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| the isotopes, collectively, that comprise a radioactive series | family
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| any of the group of univalent metals of the elements of the group 1 of the periodic table | alkali metal
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| any of the monovalent metals of group I of the periodic table | alkaline metal
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| less soluble than those of the alkali metals any of the group of bivalent metals | alkaline earth metal
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| one of the metals that can use the inner shell before using the outer shell to bond | transition metal
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| any of the chemically inert gaseous elements of group 8A or 0 of the periodic table | noble gasses
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| any of the electronegative elements that form binary salts by direct union with metals. | halogen
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| Russian chemist: helped develop the periodic law. | Mendeleev
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| any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar by virtue of having the same number of valence | Rare earth metals
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| rare-earth element any element of the lanthanide series | lanthanide
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| the series of radioactive elements that starts with actinium and ends with lawrencium | actinide series
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| any of the elements oxygen, sulfur, selenium, tellurium, and polonium, which form the VIa group in the periodic table. | chalogens
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