Atomic Model Time LINE

Bohr agreed with Rutherford’s proposal that in the atom the electrons revolve around a central positively charged nucleus that is responsible for most of the weight of the atom. But from his special evidence, he concluded that electrons are found at only certain distances from the nucleus, and have particular values of energy. ohr’s atomic theory also helped to explain the spectra. He explained the discrete lines on the hydrogen spectra by proposing if a hydrogen atom was given energy, an electron can jump to a higher shell, away from the nucleus. However they will always return back to their ground state as the atom will be unstable.

Chadwick had an abundance of knowledge he had gained from previous discoveries, which help him discover the neutron. In 1932, Chadwick carried out an experiment in which a sample of Beryllium was bombarded with alpha particles, which caused it to emit this mysterious radiation. He assumed it was gamma rays. He then discovered that this radiation, upon striking Paraffin Wax, would dislodged some of the protons, coming to the conclusion it was gamma rays. Chadwick, however did not believe that gamma rays could account for the protons from the wax. He was convinced that the beryllium was emitting neutrons.

He was awarded an 1851 Exhibition Science Scholarship, enabling him to go to Trinity College, Cambridge, Rutherford also designed a series of experiments to determine the size of the nucleus compared with that of an atom. He measured the angles of scattering and their frequency by using slits of various foils and different metals.

proposed that elements consisted of atoms that were identical and had the same mass and that compounds were atoms from different elements combined together, his atomic model was a simple sphere. He also stated that atoms of a given element are idntical in size, mass, and other properties.As democriyus he also thought that atoms cannot be subdivided, created, or detroyed. 

  Aristotle did not believe in the atomic theory and he taught so otherwise. He thought that all materials on Earth were not made of atoms, but of the four elements, Earth, Fire, Water, and Air. He believed all substances were made of small amounts of these four elements of matter. Most people followed Aristotle’s idea, causing Democritus’ idea- which was that all substances on Earth where made of small particles called atoms- to be over looked for about 2,000 years! Aristotle's view was finally proven incorrect and his teachings are not present in the modern view of the atom.

An ingenious escape was proposed in the fifth century B.C. by Democritus. He hypothesized that all matter is composed of tiny indestructible units, called atoms. Early atomic theory stated that the characteristics of an object are determined by the shape of its atoms. So, for example, sweet things are made of smooth atoms, bitter things are made of sharp atoms. Democritus also used to think that atoms couldn´t be subdivided or separeted.