Metallic Solids

The video discusses metallic solids, focusing on their properties and the electron sea model. It explains how metals are shiny, conductive, ductile, and malleable due to free electrons. The video also covers alloy formation, distinguishing between interstitial and substitutional alloys, and provides examples like brass and stainless steel. The conclusion reviews the electron model and alloy properties.

What is the primary reason metals are shiny?

• They are polished regularly.

• They are made of shiny atoms.

• They contain free electrons that reflect light.

• They have a smooth surface.

Which of the following is an example of a substitutional alloy?

• Steel

• White gold

• Electrum

• Brass

How does an interstitial alloy differ from a substitutional alloy?

• Substitutional alloys are more malleable.

• Substitutional alloys are formed by heating metals.

• Interstitial alloys fill spaces between atoms with smaller atoms.

• Interstitial alloys have larger atoms replacing smaller ones.

What characteristic of metals allows them to conduct electricity effectively?

• Presence of free electrons

• Large atomic size

• High density

• Strong metallic bonds

Why are metals considered ductile?

• They can be stretched into wires without breaking.

• They can be easily broken.

• They have a high melting point.

• They are resistant to corrosion.