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abeka phy sci 9 section 13.4
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quiz tmr (3/13)
Physical Science
9th
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18 Terms
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1
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valence electrons
located on outermost electron shell
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octet rule
__**eight**__ electrons in outermost electron shell (valence electrons)
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periodic law
elements show regular and repeating properties when arranged by increasing atomic number
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periodic table of elements
table arranged by atomic number and number of valence electrons
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period
a row on periodic table
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group
arranged by same number of valence electrons
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1, 2, 13-18
what are the main group elements?
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metals
hard, dense, shiny solids
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nonmetals
poor conductors of electricity; gasses and liquids
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semimetals
solids with characteristics between nonmetals and metals
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alkali metals
group one; very soft, shiny metals
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alkali earth metals
group two; harder, denser and less reactive
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transition metals
groups 3-12; strength and durability
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inner transition metals
between groups 3 and 4 (under table); radioactive
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13-16
what are the mixed groups?
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carbon
found in graphite and diamond
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halogens
group 17; “salt formers”
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noble gasses
group 18; found in their pure states in nature
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