unit 3 chemistry

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15 Terms

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periodic table

arrangement of elements by atomic number

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group(family)

vertical column on periodic table

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period

horizontal row on periodic table

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metal

good conductor; tends to lose electrons

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nonmetal

poor conductor; tends to gain electrons

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metalloid

element with metal and nonmetal properties

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alkali metals

group 1: very reactive metals

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alkaline earth metals

group 2 metals

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transition metals:

groups 3-12: very reactive nonmetals

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halogens:

group 17: very reactive nonmetals

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noble gases

group 18: unreactive gases

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atomic radius

size of an atom

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ionization energy

energy needed to remove an electron

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electronegativity

ability to attract electrons

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reactivity

how readily an element reacts