Answer:
A. u is the SI symbol for atomic mass unit. The positive charge of protons cancels the negative charge of the electrons. Neutrons have no charge. With regard to mass, protons and neutrons are very similar, and have a much greater mass than electrons
A Neutron.
Step-by-step explanation:
Neutrons are non-charged particles inside of an atom. An electron has a negative current, while a proton has a positive current.
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