09 - Chemistry 1000 Lecture 9: Metals and crystal...

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Chemistry 1000 Lecture 9: Metals and crystal structures Marc R. Roussel
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Classification of the elements Element Appearance Resistivity / Ω m Fluoride(s) Na silvery solid 4 . 2 × 10 - 8 ionic NaF Ca silvery solid 3 . 9 × 10 - 8 ionic CaF 2 Ni silvery solid 6 . 8 × 10 - 8 ionic NiF 2 Al silvery solid 2 . 7 × 10 - 8 molecular Al 2 F 6 Hg silvery liquid 9 . 8 × 10 - 7 ionic Hg 2 F 2 and HgF 2 Ge grey solid 4 . 6 × 10 - 2 molecular GeF 4 and GeF 2 Sb silvery solid 3 . 9 × 10 - 7 molecular SbF 3 and SbF 5 B black solid 1 . 8 × 10 4 molecular BF 3 P white solid 1 . 0 × 10 9 molecular PF 3 , PF 5 and P 2 F 4
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Metal: malleable, ductile, good conductor of heat and electricity, shiny Nonmetal: brittle when solid, poor conductor of heat and electricity (insulator) Metalloid: intermediate between metal and nonmetal, often semiconducting Semiconductor: electrical conductivity is between that of a conductor and insulator and can often be controlled, e.g. by adding energy such as UV radiation or by imposing an electric field
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09 - Chemistry 1000 Lecture 9: Metals and crystal...

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