METALLIC BONDING
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Transcript of METALLIC BONDING
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METALLIC BONDING
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Metals conduct heat and electricity
Metals have theseproperties becauseof the way their atoms are joined together.
METALLIC BONDING
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METALLIC BONDING
metal ion
mobile electrons
(de-localised)
Metals consist of ‘Giant structures’.The electrons from outer energy levels are free tomove through the whole structure . These electrons
* hold the atoms together ( + ions attract - electrons)
* allow the atoms to slide over each other (metals bend)* allow the metal to conduct heat and electricity
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METALLIC BONDING
The atoms in a metal are closely packed so ……………………………………..
The atoms are in a regular pattern so ……………………………………..
Metallic bonding is strong so ……………………………………...
PHRASE LIST:
metals have high melting points metals are dense
they have a crystal structure
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METALLIC BONDING
The atoms in a metal are closely packed so metals are dense.
The atoms are in a regular pattern so they have a crystal structure.
Metallic bonding is strong so metals have high melting points
PHRASE LIST:
metals have high melting points metals are dense
they have a crystal structure
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METALLIC BONDING
The crystals on a metal’s surface are called grains.
Crystals join together atgrain boundaries
Galvanised dustbin
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If cooled slowly larger crystals grow
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giantelectrons outer positive
electrostatic
free
Cool liquid metal slowly to increase crystal sizeSmaller grains give a harder but more brittle metal
The de-localised electrons are like glue because:
they attract the positive metal ions (hold them together)
They are not like glue because: they are able to move through the whole lattice
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METALLIC BONDING
http://www.chemguide.co.uk/atoms/structures/metals.html
The crystals on a metal’s surface are called grains.
Crystals join together atgrain boundaries
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METALLIC BONDING
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METALLIC BONDING
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METALLIC BONDING
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METALLIC BONDING
Copper ion
Zinc ionBrass
Small grains tend to stop rows of atoms sliding over each other.This makes the metal harder but more brittle.
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METALLIC BONDING
Copper ion
Zinc ionBrass
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METALLIC BONDING