The outer shell electrons of metals have low ionisation energies.Metals are a giant lattice of an array of atoms with at least one of the outermost electrons removed and free to move throughout the structure.Metals consist of a giant lattice of positive ions surrounded by a shared pool of delocalised electrons.
The delocalised electrons are mobile and can move throughout the structure.
Metallic bonding is the strong electrostatic attraction between the cations (positive ions) and delocalised electrons.
The delocalised electrons are mobile and can move throughout the structure.