Based on electron gas theory explain why metals are malleable.

Explanation

When force (stress) is applied to a metal Kernel (positive ions or lattice points layers slide over one another. The shape of the metal gets deformed.
Freely moving electrons also move around the deformed layers and the environment around the metal ions remains unchanged.
OR
According to electron gas theory a metal contains an array of positively charged metal ions in a Sea or mobile valence electrons and the bonding is non directional.
When force (stress) is applied to a metal the Kernel layers slide one over ther other. The shape of the metal gets deformed.