Metallic bonding

Definition of metallic bonding:-

Metallic bonding is the strong electrostatic attraction between a lattice of positive metal ions and a "sea" of delocalized (free-moving) outer electrons.

What are properties of pure metals?

• Malleable

• Ductile

• High melting and boiling points (most solid at room temperature)

• Good conductors of heat and electricity(as the sea of delocalised electrons can carry electric charges)

pure metals;-

They are arranged on giant regular layers of positive(because of the free outer shell electron) metal ions surrounded by a sea of outer shell electrons. As they are in orderly layers they can slide over eachother.

What are alloys?

• contain two or more differenet elements 

• they are usually between a metal and a metal but sometimes can be between a metal and non-metal.

How are alloys harder than pure metals?

They have different sized atoms which:-

• disrupt the regular structure so layers can no longer slide