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

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

What are electrons?

This model added on to previous models by showing electrons existed at certain "energy levels". However it does not accurately show what those levels look like.

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?

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

In the atomic model nicknamed the "plum pudding" model, what do the plums represent?

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

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

This model this model was the first to show a nucleus, consisting of protons and neutron. Electrons surround the nucleus but are not shown in distinct energy levels.

Who established that "electrons move around the nucleus at fixed distances called orbitals or shells"?

What subatomic particles make up the nucleus of an atom?