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The video explains how metal atoms release electrons from their outer shell, allowing these electrons to move freely through a lattice of metal cations. This movement and the resulting attraction between electrons and cations give metals their mechanical strength.

What happens to the electrons in the outer shell of metal atoms?

• They remain in the outer shell.

• They are shared with other atoms.

• They are absorbed by the nucleus.

• They are lost to form a sea of electrons.

How do the electrons behave once they are freed from the metal atoms?

• They form a rigid structure.

• They escape into the atmosphere.

• They move randomly through the metal.

• They are attracted to the nucleus.

Which of the following best describes the movement of electrons in metals?

• They are stationary.

• They move in a fixed path.

• They move in a circular motion.

• They move randomly.

What is the role of the sea of electrons in metals?

• It provides electrical insulation.

• It gives metals their color.

• It contributes to the mechanical strength of metals.

• It prevents metals from rusting.

What is the result of the attraction between electrons and metal cations?

• It gives metals their mechanical strength.

• It causes metals to melt.

• It makes metals brittle.

• It causes metals to expand.