This was the first model of the atom ever proposed. It was simple and described atoms as tiny spheres that could not be broken down into smaller pieces.

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

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

Chadwick is credited with discovering which part of the atom?

What are electrons?

Aristotle and other early Greek philosophers thought that matter was composed of four elements: air, earth, fire, and water(T/F)

What subatomic particles make up the nucleus of an atom?

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?

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

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

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.