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30 terms

Science Chapter 4 Lesson 4

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Composed of closely packed, positively charged metals ions that are surrounded by freely moving valence electrons.
metal crystal
A metal crystal is composed of closely packed, positively charged metal ions that are surrounded by freely moving ...
valence electrons
A metal crystal is composed of closely packed, .......... charged metal ions that are surrounded by freely moving ...
positively
The attraction between positive ions and electrons
metallic bond
The attraction between positive metal ions and surrounding electrons
metallic bond
Metal atoms lose electrons easily because ...
their valence electrons are held weakly
Nonmetal atoms gain electrons easily because ...
their valence electrons are held strongly
Metal atoms are likely to form metallic bonds because ...
their valence electrons are held weakly
Nonmetals are not likely to form metallic bonds because ...
their valence electrons are held strongly
What are the properties of metals?
shiny luster, malleable, ductile, electrical & thermal conductivity
Which elements have shiny luster, are malleable, ductile, and have electrical & thermal conductivity
metals
The properties of solid metals can be explained by ...
the structure of metal atoms and the bonding among the atoms
The luster of a metal is due to its ...
valence electrons
Metals are ..... because they can be bent easily and pulled into thin strands or wires.
ductile
Metals are ... because they can be rolled into thin sheets or beaten into complex shapes.
malleable
Solid metals are good conductors of ...
heat & electricity
The transfer of thermal energy is known as ...
heat
Metals are good conductors of heat because the ....... within a metal are free to move.
valence electrons
Metals usually have .... melting points.
high
Metals can be used to form the fender of a motorcycle because they are ...
malleable
When the metal parts of a motorcycle are polished, they have ...
shiny luster
Metals cool a motorcycle because they have ...
high thermal conductivity
Metals are used in electrical wires because they have ...
high electrical conductivity
Most metals are .... at room temperature?
solid
A mixture made of two or more elements, at least one of which is a metal
alloy
Most of the metallic objects you see and use are made of ...
alloys
How are alloys different than pure metals?
They are stronger and less reactive.
Why are alloys used to make most of the metallic objects that you see?
They are stronger and less reactive than pure metals.
What is harder than pure gold but still retains its beauty and shine?
gold alloy
Iron is often alloyed with one or more other elements to make ......, which is stronger and does not rust.
steel