Rate your confidence on the Atomic Model.

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.

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?  

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?

Chadwick is credited with discovering which part of the atom?

Who is credited with developing model D?

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