7th grade ch. 3 sec. 3 metals
TRANSCRIPT
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Ch. 3 Ch. 3 Sec. 3 MetalsSec. 3 Metals
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physical properties of a metal
• hardness• shininess• =can be pounded into shapes• =can be pulled out into a long wire • - can transmit heat & electricity• magnetic• most are solids at room temp.
(except ___________ )
malleableductileconductor
mercury
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can be pounded into shapes
malleable
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malleable
can be pounded into shapes
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chemical properties of a metal• __________= ease & speed at
which an element combines or reacts with other elements
• some - very reactive (ie. sodium)
• others - unreactive (ie. gold)
reactivity
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• __________= ease & speed at which an element combines or reacts with other elements
• some - very reactive (ie. sodium)
reactivity
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Chunk of sodium in school pond
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corrosion •process of reaction & wearing away
•ie. iron rusting
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alloy
• mixture of metals
• ie. copper + tin= bronze
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Metals in the Periodic Table
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Group 1- alkali metals
– from Li Fr (not H)
– very, very reactive
– have 1 valence electron
Lithium reacting with water
Potassium reacting with water
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Group 2- alkaline earth metals• 2nd column
• Be Ra
• very reactive- never alone
• lose 2 valence electrons
• most common- Ca & Mg
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Groups 3-12 - transition metals
• bridge between very reactive metals & less reactive metals
– ex: Fe, Ag, Pt
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Groups 13-16
– incl metals, nonmetals & metalloids
– ex. Al, Sn, Pb
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lanthanides & actinides- rare earth elements
• found @ bottom of periodic table• fit in periods 6 & 7• placed at bottom for convenience
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Neodymium, one of the lanthanide elements, is used in manufacturing the
tiny speakers inside stereo headphones.
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Curium, one of the actinide elements,is used as a source of high-energy particles
that heat and provide power for certain scientific equipment aboard the Mars
Exploration Rover.
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synthetic elements
• elements w/ atomic # > 92
• not found naturally on Earth
• made when nuclear particles collide
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particle accelerators• make elements above atomic #95
• move atomic nuclei until reach very high speeds
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unununium
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ununilium
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• Element 110-118, elements with three-letter symbols, have been given temporary names and symbols.
• In the future, scientists around the world will agree on permanent names and symbols for these elements.
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