Neutron stars do contain protons and electrons. It’s a misconception that they’re 100% pure neutrons.
A well-known type of neutron star is a pulsar. These rotating objects have extremely powerful magnetic fields which can only be produced by the movement of electric charges. If they were purely made of neutrons there could be no electric charges to move, and thus no magnetic fields.
It’s the periodic table of ELEMENTS, which are defined by their number of protons.
The lone neutron deserves a place before any size neutron star.
Neutron stars do contain protons and electrons. It’s a misconception that they’re 100% pure neutrons.
A well-known type of neutron star is a pulsar. These rotating objects have extremely powerful magnetic fields which can only be produced by the movement of electric charges. If they were purely made of neutrons there could be no electric charges to move, and thus no magnetic fields.