Defination Of Hardness ( Metals And Non Metals-chapter name)
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Non-metals like nitrogen, oxygen, carbon dioxide, argon, neon, helium, krypton, chlorine, and fluorine are the ones which constitute the air in our surroundings. Hardness: Out of all the non-metals, only solids are expected to be hard. Sulphur and phosphorus are quite soft, but diamond is very hard.
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Hardness: Metals are hard, on the other hand, non-metals are generally brittle. Malleability: The property of metals by which they can be beaten into thin sheets is called malleability.
Majority elements in the periodic table are metals. This includes alkali metals, transition metals, lanthanides, actinides and alkaline earth metals. Metals are separated by nonmetals on a periodic table through a zigzag line starting from carbon, till radon. The elements between the two are phosphorus, selenium and iodine.
These elements and elements right to them in the periodic table are nonmetals. Elements present just to the left of the line are termed as semimetals or metalloids. These will have the combined properties of both metals and nonmetals. metals it is not shiny, malleable or ductile nor are they good conductors of electricity. These properties of non-metals provide one means by which we can distinguish metals from non-metals.
Properties of Non-metals have less in common with each other than metals. Their physical and chemical properties vary widely. Some non-metals are solids and some are gases at room temperature.
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