Looking at the melting points of metals(metallic bonds), we see that their melting points are high. This clues us into the fact that they too are giant structures.$^0$
In metals, the atoms are held in a regular lattice. Due to their tight packing, the outer shell electrons separate from the atoms. This electrons are free to move(free electrons) and form a sea of electrons. The metallic bonding is the attraction between the metal ions and the free electrons.$^0$
Metals usually have a high melting point as breaking up the lattice is an energy heavy task.$^0$
Metals are malleable and ductile. This is because the layers in the lattice can slide over each other without messing with the bond as te electrons are free to move too.$^0$
Metals are good conductors of heat. The free electrons are able to take in heat energy and transfer it through the metal.$^0$
Metals are good conductors of electricity. The free electrons can move through the lattice carrying a charge when a voltage is applied.$^0$