Metallic Bonding

Metallic Bonding : The positive metal ions are attracted to the delocalised negative electrons.

They form a lattice of closely packed positive ions in a sea of delocalised electrons held by electrostatic forces.

Metal exist as giant metal lattice. Delocalised electron consist of 5 layers

Properties of Metal :

Good Conductor of electricity

→ Free moving delocalised electrons move through the structure carrying a charge

→ eg metal wire, at the ve - terminal an electron will join the e- sea. A different e - will leave the wire at the ve - terminal

Good Conductor of heat

→ Kinetic energy passed and spread out by the vibrations of close together ions and delocalised electrons.

High melting point

→ Giant lattice structure : strong electrostatic attraction between positive metal ions and negatively delocalised electrons held ( sea )

Strong ( Increase strength )

→ Large + ve charge on metal ion more delocalised electrons released so the stronger electrostatic attraction between the + ve ions and - ve delocalised electrons.

→ Smaller the ions radius, stronger the nuclear pull between e - and the nucleus = stronger bond