The World of Metals and Non-metals Class 7 (Curiosity)

The World of Metals and Non-Metals introduces the properties used to compare metallic and non-metallic materials. It connects physical properties and simple chemical behaviour with the way materials are selected and used.

Students learn that categories are based on patterns, but exceptions exist. A single property should not be used to classify every unknown substance with certainty.

Physical properties

Metals are generally lustrous, malleable, ductile, sonorous and good conductors of heat and electricity. Non-metals are generally dull, brittle when solid and poor conductors.

The chapter explores:

• Lustre

• Hardness

• Malleability

• Ductility

• Sonority

• Heat conduction

• Electrical conduction

• Physical state

• Safe testing of material properties

• Important exceptions to general patterns

Students connect properties with use. Copper is suitable for electrical wires because it conducts electricity and can be drawn into strands. Metals used for cookware must conduct heat and withstand cooking temperatures, while handles are made from poorer heat conductors.

Chemical behaviour and everyday importance

At an introductory level, students examine how certain metals and non-metals react with substances such as oxygen and how the products may differ. They also consider rusting, corrosion and the need to protect useful materials.

The chapter connects metals and non-metals with tools, buildings, transport, electronics, agriculture and the human body. It also encourages responsible use because metal extraction and disposal affect the environment.

Learn Metals and Non-Metals with Teachoo

Teachoo provides Metals and Non-Metals Class 7 notes and NCERT chapter solutions using comparison tables and property-based explanations. Students can answer classification and application questions by linking a use to the relevant property.

How should students prepare?

Make a two-column comparison table, then add a third column for exceptions. For application questions, name the property first and explain why it suits the stated use. Do not say that every shiny object is a metal.

Frequently Asked Questions

What is malleability?

Malleability is the ability of a material to be hammered or rolled into thin sheets without breaking.

What is ductility?

Ductility is the ability of a material to be drawn into wires.

Are all metals hard solids?

No. Properties describe general patterns. Some metals are soft, and mercury is liquid at ordinary room temperature.

Why are metals commonly used for wires?

Many metals conduct electricity well and are ductile, so they can be drawn into long wires.

What does Teachoo provide for this chapter?

Teachoo provides clear concepts and solutions to questions at the end of The World of Metals and Non-Metals Class 7.