Delocalised electrons

The video explains the electron sea model, where free electrons move through a lattice of metal ions, giving metals their properties like electrical conductivity.

What happens to the outer shell electrons in metals?

• They are tightly bound to the nucleus.

• They form a sea of free electrons.

• They are shared with non-metals.

• They disappear completely.

How do free electrons behave in a metal lattice?

• They remain stationary.

• They flow freely throughout the lattice.

• They are absorbed by metal ions.

• They form covalent bonds.

What is the role of free electrons in metals?

• They make metals brittle.

• They enable metals to conduct electricity.

• They give metals their shiny appearance.

• They prevent metals from rusting.

Which property of metals is directly related to the presence of free electrons?

• Magnetic properties

• Electrical conductivity

• Density

• Color

Why are metals good conductors of electricity?

• Because they have a high melting point.

• Because they are malleable.

• Because they have free, delocalized electrons.

• Because they are dense.