History of the Atom

Around 460 BC, Greek philosopher, Democritus, developed an idea of corpuscles. He judging that if you break a piece of matter in half, therefore break it in half again, how many breaks will you depict before you commode break it no further. However Democritus approximation had no lasting effect on other stainless philosophers, even Aristotle dismissed this idea and called it worthless. For more than 2000 nobody go on the explorations that the greeks started on atoms. In the 1800s an English chemist, John Dalton did experiments with discordant chemicals that see to consist of elementary lumpy particles (atoms). Although he did not whap round their anatomical structure, he knew that the evidence pointed to something fundamental In 1897, the English physicist J.J. Thomson sight the electron and proposed a model for the structure of the atom. In 1900 goo Planck, a professor of theoretical physics in Berlin showed that when you brandish atoms strong enough, su ch as when you groove an object until it glows, you can measure the energy only in discrete units. He called these energy packets, quanta. In 1911 Ernest Rutherford thought it would elevate interesting to flunk atoms with these of import rays, figuring that this experiment could wonder the inside of the atom (sort of like a probe).

He use Radium as the source of the alpha particles and shinned them onto the atoms in specie cut across. Behind the foil sat a fluorescent fixture screen for which he could identify the alpha particles impact. The results of the experiments came unexpected. just about of the alpha particles went smoothly through the foil. unaccompanied an occasiona l alpha veered sharply from its original pat! h, sometimes springy straight jeopardize from the foil! Rutherford reasoned that they must go away separated by tiny bits of positively charged matter. Most of the space around these positive centers had nothing in them. He thought that the electrons must exist somewhere within this unemployed space. not until 1919 did Rutherford finally identify the...If you want to get a estimable essay, order it on our website: OrderEssay.net

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