AND if they already knew that the electron was small and negative, then the atom must have a small positive nucleus with the electrons around them. Though several alternative models were advanced in the 1900s by Kelvin and others, Thomson held that atoms are uniform spheres of positively charged matter in which electrons are embedded. If the positive alpha particles mostly passed through the foil, but some bounced back. Thomson atomic model, earliest theoretical description of the inner structure of atoms, proposed about 1900 by William Thomson (Lord Kelvin) and strongly supported by Sir Joseph John Thomson, who had discovered (1897) the electron, a negatively charged part of every atom. How could that be if the plumb pudding model was correct? Rutherford's experiment prompted a change in the atomic model. Rutherford found that most of them went right through the foil. If you shoot these positive alpha particles at this positive pudding atom, they should mostly bounce off, right? Well, that is not what happened. Thomson’s Atomic Model In 1897, Thomson claimed that the basic body of an atom is spherical in shape that contains electrons (tiny particles within the atom that create a negative charge) and a positively charged jelly around the electrons that neutralize the charge of the electrons. The electrons are embedded in this sphere so as to give the most stable electrostatic arrangement. He proposed that an atom is shaped like a sphere with a radius of approximately 10 -10 m, where the positive charge is uniformly distributed. Structure of atoms: electrons in orbits, protons and. Thomson proposed the first of many atomic models to come. He shot some alpha particles (which are really just the nucleus of a helium atom) at some really thin gold foil. Daltons atomic theory was the first complete attempt to describe all matter in terms of atoms and their properties. From billiard ball and Plum pudding models to Planetary model and Bohr theory. Ernest Rutherford said one day "hey, I think I will shoot some stuff at atoms." I am sure his wife said "oh, Ernie" (she probably called him Ernie) "if it makes you happy to play with your little physics stuff, go ahead.
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