Atom

The atom was the basic unit of matter that made up everything in the universe. All atoms were held together by electrical charge.

The atom was split by Ernest Rutherford. (TV: The Lazarus Experiment)

The Bad Wolf entity was powerful enough to destroy the Dalek Fleet attacking Earth in 200,100 by reducing every Dalek and every ship to atoms. (TV: The Parting of the Ways)

Davros had developed and successfully tested a weapon, the reality bomb, capable of cancelling the electric charge that held atoms together. (TV: Journey's End)

Negatively-charged atoms were known as anions. (AUDIO: The Bride of Peladon)

Water contained hydrogen atoms. (TV: Arc of Infinity)

When Shirley Bingham asked the Fourteenth Doctor how the Toymaker accomplished his seemingly physically impossible feats, he asked if she would believe him if he told her that he manipulated atoms with the power of thought. She asked if this was, in fact, what he did, and he admitted that it was not, telling her there was nothing she could do to fight him. (TV: The Giggle)