Hydrogen-like atoms are atoms with a single electron "orbiting" a nucleus which has more than one nucleon. As @Xerxes pointed out in a comment, you can in principle have a nucleus made up of particles other than protons and neutrons (nucleons). Positronium might be an extreme example of this.

Wikipedia actually has an entry about Hydrogen-like atoms which goes somewhat beyond what you asked.

Hydrogen-like atoms are atoms with a single electron "orbiting" a nucleus that has more than one nucleon. As @Xerxes pointed out in a comment, you can in principle have a nucleus made up of particles other than protons and neutrons (nucleons). Positronium might be an extreme example of this.

Wikipedia actually has an entry about Hydrogen-like atoms which goes somewhat beyond what you asked.

Hydrogen-like atoms are atoms with a single electron "orbiting" a nucleus which has more than one nucleon.

Wikipedia actually has an entry about Hydrogen-like atoms which goes somewhat beyond what you asked.

Hydrogen-like atoms are atoms with a single electron "orbiting" a nucleus which has more than one nucleon. As @Xerxes pointed out in a comment, you can in principle have a nucleus made up of particles other than protons and neutrons (nucleons). Positronium might be an extreme example of this.

Wikipedia actually has an entry about Hydrogen-like atoms which goes somewhat beyond what you asked.