When was the electron cloud discovered?

Answer 1

The electron is a fundamental subatomic particle that was identified and assigned the negative charge in 1897 by Sir John Joseph Thomson (J.J. Thomson) and his team of British physicists.

Answer 2

J.J.Thomson first suggested that there were negatively charged particles within the atom. This was in 1897. He set up an experiment which measured the deflection of charged particles and concluded that the ones fired from a cathode ray tube (electrons) were 'bodies much smaller than atoms'. This was controversial, as atoms were considered fundamental (a-tom means uncuttable). Nevertheless, Thomson was right.

Answer 3

Until 1897, scientists believed atoms were indivisible, the ultimate particles of matter, but Thomson proved them wrong when he discovered that atoms contained particles known as electrons. Thomson discovered this through his explorations on the properties of cathode rays. Thomson found that the rays could be deflected by an electric field (in addition to magnetic fields, which was already known). By comparing the deflection of a beam of cathode rays by electric and magnetic fields he was able to measure the particle's mass. This showed that cathode rays were matter, but he found that the particles were about 2000 times lighter than the mass of the lightest atom, hydrogen. He concluded that the rays were composed of very light, negatively charged particles which he called "corpuscles". (Later scientists preferred the name electron which had been suggested by George Johnstone Stoney in 1894, prior to Thomson's actual discovery).

Thomson believed that the corpuscles emerged from the atoms of the trace gas inside his cathode ray tubes. He thus concluded that atoms were divisible, and that the corpuscles were their building blocks. To explain the overall neutral charge of the atom, he proposed that the corpuscles were distributed in a uniform sea of positive charge; this was the plum pudding model as the electrons were embedded in the positive charge like plums in a plum pudding (although in Thomson's model they were not stationary).

Answer 4

In 1912 a Danish physicist, Niels Bohr came up with a theory that said the electrons do not spiral into the nucleus and came up with some rules for what does happen. (This began a new approach to science because for the first time rules had to fit the observation regardless of how they conflicted with the theories of the time.

Answer 5

Electron was discovered in 1897 by J.J. Thomson.

Answer 6

Sometime in the 1920's to 1930's.

Different person: no it was actually discovered in 1987 by Sir John Joseph Thomson and his team of British physicists.

Answer 7

The electron is a fundamental subatomic particle that was identified and assigned the negative charge in 1897 by J.J. Thomson and his team of British physicists.

Answer 8

1897 by Briton Sir Joseph John "J. J." Thomson

Answer 9

1922