Question

1. what physical properties do metals have because of electron delocalization?

Explanation:

Electron delocalization in metals means electrons are not fixed to one atom. This allows them to move freely. For electrical conductivity, the free - moving electrons can carry an electric current. In thermal conductivity, the electrons can transfer heat. Malleability and ductility occur because when the metal is deformed, the electron "sea" can adjust, keeping the metal structure intact.

Answer:

Metals have electrical conductivity (free - moving electrons carry current), thermal conductivity (electrons transfer heat), malleability (electron sea adjusts during deformation), and ductility (same electron - sea adjustment mechanism during stretching) due to electron delocalization.