What evidence did JJ Thomson observe that led him to discover the electron?

What evidence did JJ Thomson observe that led him to discover the electron?

In 1897, J.J. Thomson discovered the electron by experimenting with a Crookes, or cathode ray, tube. He demonstrated that cathode rays were negatively charged. In addition, he also studied positively charged particles in neon gas.

What evidence did Thomson have for electrons are identical and are present in all atoms?

What evidence did Thomson have for this statement: Opposite charge attract and like charges repel. The positive plate attracted the cathode ray which means the ray had to be made of tiny NEGATIVELY charged particles called electrons. Electrons are identical and are present in all atoms.

What did Thomson discover about the atom and what was his experiment called?

Thomson discovered the first subatomic particle, the electron, while researching cathode rays. To explain the neutrality of atoms, Thomson proposed a model of the atom in which negative electrons are scattered throughout a sphere of positive charge. He called his atom the plum pudding model.

What did JJ Thomson discover about atoms?

In 1897 Thomson discovered the electron and then went on to propose a model for the structure of the atom. His work also led to the invention of the mass spectrograph.

What did Rutherford’s gold foil experiment determine?

The gold-foil experiment showed that the atom consists of a small, massive, positively charged nucleus with the negatively charged electrons being at a great distance from the centre. Niels Bohr built upon Rutherford’s model to make his own.

What was Ernest Rutherford’s experiment?

Ernest Rutherford’s most famous experiment is the gold foil experiment. A beam of alpha particles was aimed at a piece of gold foil. Most alpha particles passed through the foil, but a few were scattered backward. This showed that most of the atom is empty space surrounding a tiny nucleus.

What did Thomson have for ” atoms of all elements contain electrons “?

What experimental evidence did Thomson have for “atoms of all elements contain electrons”.? Thomson got the same result no matter what metal or gas was used in the experiment. The ratio of charge to mass of an electron also remained constant. Would you expect 2 electrons to attract or repel?

Who was involved in the Thomson atomic model?

Thomson atomic model was proposed by William Thomson in the year 1900. This model explained the description of an inner structure of the atom theoretically. It was strongly supported by Sir Joseph Thomson, who had discovered the electron earlier. During cathode ray tube experiment, a negatively charged particle was discovered by J.J. Thomson.

What are the limitations of Thomson’s atomic model?

Limitations of Thomson’s atomic model 1 It failed to explain the stability of an atom because his model of atom failed to explain how a positive charge holds the negatively charged electrons in an atom. 2 Thomson’s model failed to explain the scattering of alpha particles by thin metal foils 3 No experimental evidence in its support

What did Thomson call the negative particle of an atom?

The negative particle was called an electron. Thomson assumed that an electron is two thousand times lighter than a proton and believed that an atom is made up of thousands of electrons. In this atomic structure model, he considered atoms surrounded by a cloud having positive as well as negative charges.