What were J. J. Thomson's major contributions to the atomic theory?

Which scientist proposed the "plum pudding model" of the atom?

What are electrons?

The cathode-ray tube was used to discover the ____ by ____.

This is the most complete and current model of the atom. It consists of 61 elementary particles. Electrons are located in complex orbitals.

Place the following atomic models in order, from earliest to latest:

Which scientist is responsible for first stating that all the atoms of a particular element are identical but are different from the atoms of all other elements?

In the gold foil experiment, most of the positively charged alpha particles passed through the gold foil, but some were deflected or bounced back. What did we conclude because of this?

In Rutherford's famous "Gold Foil" experiment, some particles passed through the foil, some were deflected, and some were bounced straight back. This observation made Rutherford conclude

Which scientist measured the charge on an electron as 1.602 x 10-19 Coulombs?

What scientist is best known for his gold foil experiment?

Chadwick is credited with discovering which part of the atom?

This model was developed after J.J. Thompson discovered electrons, a particle smaller than an atom. It shows electrons floating freely in a positive region.