Transcription of STRUCTURE OF ATOM - NCERT
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STRUCTURE OF ATOM - NCERT
26 CHEMISTRYThe rich diversity of chemical behaviour of different elementscan be traced to the differences in the internal STRUCTURE ofatoms of these 2 STRUCTURE OF ATOMA fter studying this unit you will beable to know about the discovery ofelectron, proton and neutron andtheir characteristics; describe Thomson, Rutherfordand Bohr atomic models; understand the importantfeatures of the quantummechanical model of atom; understand nature ofelectromagnetic radiation andPlanck s quantum theory; explain the photoelectric effectand describe features of atomicspectra; state the de Broglie relation andHeisenberg uncertainty principle; define an atomic orbital in termsof quantum numbers; state aufbau principle, Pauliexclusion principle and Hund srule of maximum multiplicity; write the electronic configurationsof existence of atoms has been proposed since the timeof early Indian and Greek philosophers (400 ) whowere of the view that atoms are the fundamental buildingblocks of matter.
obtained from hydrogen and was called proton. This positively charged particle was characterised in 1919. Later, a need was felt for the pr esence of electrically neutral particle as one of the constituent of atom. These particles wer e discover ed by Chadwick (1932) by bombarding a thin sheet of beryllium by α-particles. When electrically ...
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