Answer: Electrons are the particles that circles the nucleus of an atom.
Explanation: Each atom has its nucleus. Nucleus present at the centre of the atom.
Inside the nucleus protons and neutrons are present. Protons has positively charged particles on the other hand Neurons are neutral they have no charge.
So, the positive charge of protons make nucleus a positively charged.
Electrons are negatively charged particles. They circles around the positively charged nucleus. Positive charge of nucleus make negatively charged electrons to circle around nucleus.