5 exceptional metals + nonmetals
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1. Lustre: Not only metals have metalic lustre but certain non-metals like iodine and graphite have also metallic lustre.
2. Melting point: Some metals like sodium potassium have low meltng point, mercry is liquid at room tem. Carbon a non-metal has high melting point.
3. Density: Alkali metals have low density. Lithium has specific gravity of 0.59 whereas Iodine a non-metal has specific gravity of 4.9.
4.Conductivity: Not only metals are good conductor of electricity and heat but non-metals like graphite and gas carbon are also good conductor of heat and electricity. Some metals like Bismuth and Lead, are poor conductors of electricity.
5. Action with acids: All metals do not give off hydrogen by reaction with acids, e.g. Copper, mercury, Silver, Gold, Platinum etc.
6. Hardness: All metals are not very hard, e.g. Lead is a very soft metal. Diamond an non-metal is the hardest substance so far known to the man.
2. Melting point: Some metals like sodium potassium have low meltng point, mercry is liquid at room tem. Carbon a non-metal has high melting point.
3. Density: Alkali metals have low density. Lithium has specific gravity of 0.59 whereas Iodine a non-metal has specific gravity of 4.9.
4.Conductivity: Not only metals are good conductor of electricity and heat but non-metals like graphite and gas carbon are also good conductor of heat and electricity. Some metals like Bismuth and Lead, are poor conductors of electricity.
5. Action with acids: All metals do not give off hydrogen by reaction with acids, e.g. Copper, mercury, Silver, Gold, Platinum etc.
6. Hardness: All metals are not very hard, e.g. Lead is a very soft metal. Diamond an non-metal is the hardest substance so far known to the man.
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