Q1
Non-metals are generally:
Apoor conductors of electricity
Bgood conductors of electricity
Calways liquid
Dalways malleable
CBSEClass 7 (CBSE)ScienceCh 4 · Topic 2
Properties of Non-metals
Learning the common physical properties shared by non-metals.
Core concept
Graphite, a form of carbon, is a notable exception — unlike most non-metals, it conducts electricity well and has a somewhat lustrous appearance, which is why it is used in pencil leads and as an electrode material in batteries. Non-metals play essential biological roles too: oxygen is needed for respiration, nitrogen makes up most of the air we breathe, and carbon forms the basis of all living organisms' molecules.
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• Non-metals are generally non-lustrous, brittle, and poor conductors of heat/electricity.
• Common non-metals: sulphur, carbon, oxygen, nitrogen.
• Graphite (a form of carbon) is an exception — it conducts electricity and has some lustre.
• Non-metals play key biological roles: oxygen for respiration, nitrogen in air, carbon in living molecules.