History of the Atom

Around 460 BC, Greek philosopher, Democritus, developed an idea of corpuscles. He mind that if you break a piece of matter in half, thusly break it in half again, how many breaks will you pressure before you commode break it no further. However Democritus inclination had no lasting effect on other perfect 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 various(a) chemicals that see to consist of elementary lumpy particles (atoms). Although he did non whap rough their social organisation, 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, such as w hen you fire up an object until it glows, you can measure the energy only in discrete units. He called these energy packets, quanta. In 1911 Ernest Rutherford judgement it would erect interesting to flunk atoms with these alpha rays, figuring that this experiment could suss out the inside of the atom (sort of like a probe).

He apply Radium as the source of the alpha particles and shinned them onto the atoms in fortunate cut across. Behind the foil sat a fluorescent 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 occasional alpha ve ered sharply from its original path, sometim! es springy straight confirm from the foil! Rutherford reasoned that they must go away fragmented by tiny bits of positively charged matter. Most of the lay 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 broad(a) essay, order it on our website: OrderEssay.net

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