Ch.4 matter
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| compund | is a distinct substance that is composed of the atoms of two or more elements and always contains exactly the same relative masses of those elements
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| chemical formula | the types of atoms and the number of each type in each unit (molecule) of a given compound are conveniently expressed
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| elements symbol | abbreviations of elements
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| law of constant compsition | that a given compound always has the same composition, regardless of where it comes from
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| electrons | negative particles
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| nuclear atom | an atom with a dense center of positive charge around which tiny electrons moved in a space that was otherwise
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| .proton | has the same magnitude (size) of charge as the electron, but its charge is positive
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| neutron | is slightly more massive then a proton. It has no charge
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| isotopes | atoms with the same number of protons but different numbers of neutrons
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| atomic number | number of neutrons and the number of atoms
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| mass number | the sum of the number of neutrons and the number of protons in a given nucleus
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| periodic table | list of elements that increase by atomic number
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| groups | families of elements with similar chemical properties that lie in the same vertical column on the periodic table
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| alkaline metals | first column of elements (group 1)
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| alkaline earth metals | Group 2 elements
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| halogens | group 7 elements
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| noble gases | group 8 elements
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| transition metals | large collection of elements that spans many vertical columns
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| most elements are | metals
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| physical properties of metals | efficient conduction of heat and elctricity
malleability
ductility
a lustrous appearance
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| malleability | can be hammered into thin sheets
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| ductility | can be pulled into wires
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| lustrous | shiny
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| nonmetals | relatively small number of elements that appear in the upper right corner of the periodic table
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| metalloids | elements that show a mixture of metallic and nonmetallic properties
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| diatomic molecules | molecules made up of of two atoms
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| allotropes | different forms of a given element
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| buckminstrefullerene | three allotropes of carbon are the familiar and graphite forms plus a form that has only recently discovered
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Created by:
madison.w
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