Name three examples of how the atom has changed since Rutherford's discovery of the nucleus .

Rutherford overturned Thomson's model in 1911 with his well-known gold foil experiment, in which he demonstrated that the atom has a tiny, high- mass nucleus. In his experiment, Rutherford observed that many alpha particles were deflected at small angles while others were reflected back to the alpha source.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a