Class 8 Science – Chapter 4
Materials: Metals and Non-Metals
Page 2: Physical Properties

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1️⃣ Physical Properties

The properties of materials that can be observed or measured without changing their chemical nature are called physical properties.

2️⃣ Physical Properties of Metals

• Lustrous: Metals have a shiny surface.
• Hard: Most metals are hard (except sodium and potassium).
• Malleable: Metals can be beaten into thin sheets.
• Ductile: Metals can be drawn into thin wires.
• Good conductors: Metals conduct heat and electricity well.
• Sonorous: Metals produce a ringing sound when struck.

3️⃣ Physical Properties of Non-Metals

• Dull: Most non-metals do not have shine.
• Soft: Many non-metals are soft.
• Brittle: Non-metals break easily when beaten.
• Poor conductors: They do not conduct heat and electricity well.
• Not sonorous: They do not produce sound when struck.

📌 Note: Some non-metals like graphite conduct electricity, and iodine is shiny.