It is the simplest form of the matter. Smallest unit of an element is known as atom. Total number of the known elements is 118 out of which 98 elements occur naturally and 20 are formed by artificial transmutation.
Examples: Na, K, Mg. Al, Si, P, C, F, Br etc. Compound:It is a non-elemental pure compound. Formed by chemical combination of two or more atoms of different elements in a fixed ratio. Examples: H2O, CO2, C6H12O6 etc. Mixture:Formed by physical combination of two or more pure substances in any ratio. Chemical identity of the pure components remains maintained in mixtures. Homogeneous mixtures are those whose composition for each part remains constant. Example, Aqueous and gaseous solution. Heterogeneous mixtures are those whose composition may vary for each and every part. Example, Soil and concrete mixtures. Physical Quantities and Their Measurement: Fundamental Units:-These units can neither be derived from one another nor can be further resolved into any other units. Seven fundamental units of the S.I. system.
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