Physical properties of Non-Metals :-
1. Neither malleable nor ductile but brittle - they break into pieces when hammered.
Sulphur and phosphorus.
2. Do not conduct heat or electricity-
- Carbon ( in form of graphite)is the only non-metal which is a good conductor of electricity.
3. Dull in appearance - No shine
4. Soft and easily broken - has low strength like graphite.
- Iodine has luster.
5. Solid, liquid or gas at room temp. -
- Diamond ( an allotrope of carbon) is the hardest natural substance.
- Allotropes are two or more different forms of the same element.
Solid – carbon, sulphur, phosphorus.
Liquid – bromine
Gas – hydrogen, oxygen, nitrogen, chlorine.
6. Low melting and boiling points -
- Diamond has high melting point.
7. Low densities -
8. Non-sonorous-
9. Have different colours -
Sulphur is yellow, phosphorous is white or red, graphite is black, chlorine is yellowish green, hydrogen and oxygen are colourless.
