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प्रश्न
Write the physical properties of non–metals.
उत्तर
Physical properties of non–metals:
1. Physical state:
Non–metals occur as solids, liquids, or gases at normal temperature; for example, sulfur, and phosphorus occurs in solid-state while bromine occurs in the liquid state. Gases like oxygen, nitrogen, etc., occur in the gaseous state.
2. Hardness:
Non–metals are generally not hard except diamond, (a form of carbon)
3. Lustre:
Non–metals have a dull appearance; Graphite and iodine are exceptions as they are shiny and lustrous.
4. Density:
Non – Metals are generally soft and have low densities. The exception here is diamond (a form of carbon) which is the hardest naturally occurring substance
5. Melting point and boiling point:
Non–metals have a low melting point and boiling points. However, carbon, silicon, and boron are exceptions.
6. Tensile strength:
Non–metals do not have tensile strength. However, carbon fiber (a form of carbon) is as tensile as steel.
7. Malleability:
Non–metals are non-malleable. If hammered, they form a powdery mass. Actually non – metals in the solid states are brittle in nature.
8. Ductility:
Non–metals are not ductile. Carbon fiber is highly ductile.
9. Conductivity:
Non – Metals are generally bad conductors of electricity. Graphite (a form of carbon) is an exception.
10. Sonorous:
Non–metals do not produce sound (non–sonorous) when hit.
