Atoms and the Periodic Table
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Atom
the smallest part of an element that has all the properties of that element
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Compound
two or more elements that are chemically combined to a certain ratio
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Mixture
two or more different substances mingled with each other but not chemically combined
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Isotope
Atoms of the same element but with different numbers of neutrons
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mass number
the average mass for all known isotopes
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Molecule
Two or more atoms joined together; can be the same or different
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periodic table
arranges in order of size of atoms
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electronic configuration
the arrangement of electrons in an atom
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A column on the periodic table
group
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a row on the periodic table
period
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Group 1
alkali metals
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Group 2
alkaline earth metals
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Group 7
Halogens
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Group 8
noble gases
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