Transcription of Chapter Twelve ATOMS - Prashanth Ellina
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Chapter Twelve ATOMS - Prashanth Ellina
INTRODUCTIONBy the nineteenth century, enough evidence had accumulated in favour ofatomic hypothesis of matter. In 1897, the experiments on electric dischargethrough gases carried out by the English physicist J. J. Thomson (1856 1940) revealed that ATOMS of different elements contain negatively chargedconstituents (electrons) that are identical for all ATOMS . However, ATOMS on awhole are electrically neutral. Therefore, an atom must also contain somepositive charge to neutralise the negative charge of the electrons. But whatis the arrangement of the positive charge and the electrons inside the atom?In other words, what is the structure of an atom?The first model of atom was proposed by J. J. Thomson in to this model, the positive charge of the atom is uniformlydistributed throughout the volume of the atom and the negatively chargedelectrons are embedded in it like seeds in a watermelon. This model waspicturesquely called plum pudding model of the atom.
Physics 414 12.1 INTRODUCTION By the nineteenth century, enough evidence had accumulated in favour of atomic hypothesis of matter. In …
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