Transcription of STRUCTURE OF ATOM Objectives - NCERT
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STRUCTURE OF ATOM Objectives - NCERT
29 STRUCTURE OF ATOMThe 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; and 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.
known as oil drop experiment (1906-14), to determine the charge on the electrons. He found the charge on the electron to be – 1.6 × 10–19 C. The present accepted value of electrical charge is – 1.602176 × 10–19 C. The mass of the electron (m e) was determined by combining these results with Thomson’s value of e /m e ratio.
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