Atomic Research

Until the final years of the nineteenth century, the accepted model of the section resembled that of a billiard ball - a refined, solid sphere. In 1897, J. J. Thomson dramatically changed the modern view of the atom with his disco sure of the electron. Thomsons fake suggested that the atom was not an indivisible pinch as fast iodine Dalton had suggested but, a jigsaw puzzle make of belittleder pieces. Thomsons thought of the electron came from his work with a nineteenth century scientific curiosity: the cathode ray tube. For years scientists had cognise that if an electric live was passed through a vacuum tube, a stream of radiance material could be seen; however, no one could explain why. Thomson strand that the mysterious glowing stream would worm toward a positively charged electric plate. Thomson theorized, and was later turn out correct, that the stream was in fact made up of small particles, pieces of atoms that carried a oppose charge. These particles were la ter named electrons. After Eugen Goldsteins 1886 discovery that atoms had positive charges, Thomson imagined that atoms looked wish well pieces of raisin bread, a structure in which clumps of small, negatively charged electrons (the raisins) were scattered inside a blot of positive charges.

In 1908, Ernest Rutherford, a former student of Thomsons, prove Thomsons raisin bread structure incorrect. Rutherford performed a series of experiments with radioactive of import particles.  While it was unclear at the time what the alpha particle was, it was known to be very tiny.  Rutherford fired tiny alpha particles at solid objects much(prenominal) as opulent! foil.  He make up that while close to of the alpha particles passed right through the capital foil, a small number of alpha particles passed through at an angle (as if they had bumped up against something) and some bounced straight back desire a lawn tennis ball hitting a wall.  Rutherfords experiments suggested that gold foil, and matter in general, had holes in it!  These holes allowed most of...If you want to desexualise a teeming essay, order it on our website: BestEssayCheap.com

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