STRUCTURE OF ATOM Objectives

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29STRUCTURE OF ATOMThe rich diversity of chemical behaviour of different elementscan be traced to the differences in the internal STRUCTURE ofatoms of these 2STRUCTURE OF ATOMAfter 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; and write th

STRUCTURE OF ATOM 31 material of electrodes and the nature of the gas present in the cathode ray tube. Thus, we can conclude that electrons are basic constituent of all the atoms. 2.1.2 Charge to Mass Ratio of Electron In 1897, British physicist J.J. Thomson measured the ratio of electrical charge toe the mass of electron ( m e ) by using ...

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