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

Question

Quizplus · Accepted Answer

When a positron (antimatter counterpart of an electron) orbits an antiproton (antimatter counterpart of a proton), it forms an atom of anti-hydrogen. This is because the combination of a positively charged antiproton and negatively charged positron forms a neutral anti-hydrogen atom. Options A, B, and C are not correct because positronium is formed by a bound state of a positron and an electron, unobtainium is not a real element, and anti-helium would be formed by combining two antiprotons and two positrons.

A Positron Orbiting an Antiproton Would Make Up an Atom