Who said we can predict where electrons will be?
In the 1920s, Erwin Schrödinger proposed that electrons travel in waves, which means their exact positions cannot be determined. He developed an equation to calculate the chances of an electron being in any given place.
Who said electrons have a fixed path?
According to the Bohr model, often referred to as a planetary model, the electrons encircle the nucleus of the atom in specific allowable paths called orbits. When the electron is in one of these orbits, its energy is fixed.
What did Dalton do that Democritus did not do in developing his atomic theory?
What did Dalton do in developing his theory that Democritus did not do? He experimented with different substances and published his atomic theory. In order to explain this, atoms must be considered mostly empty space, with a tiny part made of highly dense matter.
Who said this theory led to the plum pudding model?
In 1897, the English scientist named J.J. Thomson provided the first hint that an atom is made of even smaller particles. He discovered the presence of a negative particle in the atom – the electron. He proposed a model of the atom that is sometimes called the “Plum Pudding” model.
Who said electrons exact location Cannot be predicted?
2 Answers. The Heisenberg uncertainty principle states that the exact position and momentum of an electron cannot be simultaneously determined.
How did Rutherford disprove Dalton’s theory?
The electrons revolve in circular orbits about a massive positive charge at the centre. His model explained why most of the α particles passed straight through the foil. The small positive nucleus would deflect the few particles that came close. The nuclear model replaced the plum pudding model.
Why was the plum pudding model rejected?
Explanation: Though the plum pudding model proposed by J.J Thomson was able to explain the stability of atom; it could not satisfactorily explain the results of the gold foil experiment conducted by Rutherford. These were the reasons which led to rejection of Thomson’s model of atom.
Who discovered the electron with a cathode ray tube experiment?
During the 1880s and ’90s scientists searched cathode rays for the carrier of the electrical properties in matter. Their work culminated in the discovery by English physicist J.J. Thomson of the electron in 1897.