Metallic Bonding
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Definition of metallic bond
• electrostatic attraction between the delocalised electrons and the rows of positive metal ions (cations)
Are metals a conductor?
YES - as solids and molten - Delocalised electrons can flow - movement of elections also means energy can be transferred quickly through material, so good conductors of heat
Do metals has a high to low melting point?
HIGH - strong metallic bond - require lots of energy to break
Are pure metals hard or soft?
Malleable + Ductile - atoms are all the same size - therefore layers of atoms can slide easily over each other when a force is applied
What are alloys
• mixture of metals / metals with carbon
why are alloys harder when force is applied?
• different sized atoms of metals/carbon • stops layers of atoms sliding over each other so easily
Steel is a alloy of what
Iron Iron+carbon