A positron orbiting an antiproton would make up an atom of
A) positronium.
B) anti-hydrogen.
C) anti-helium.
D) unobtainium.
E) none of these

Question

Quizplus · Accepted Answer

A positron orbiting an antiproton would form an atom of anti-hydrogen, as the positron is the antimatter counterpart of the electron, and the antiproton is the antimatter counterpart of the proton. Together, they mimic the structure of a hydrogen atom, but with antimatter particles.

A Positron Orbiting an Antiproton Would Make Up an Atom