A third type of subatomic particle, electrons, move around the nucleus. The electrons have a negative electrical charge. An atom usually contains an equal number of positively charged protons and negatively charged electrons.
Answer:
An electron
Explanation:
An electron is a negative charged particle that travels in the space around the nucleus, it resides outside of the nucleus. On the other hand, protons and neutrons are found un the nucleus of an atom.
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