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Neutron and Proton have about the same mass.
How neutron and proton can be compare:
Proton: Positively charged subatomic particles that reside in the nucleus.
Neutron: Neutrally charged subatomic particles that reside in the nucleus.
A summarized in Table 2.1, protons are positively charged, neutrons are uncharged and electrons are negatively charged. The negative charge of one electron balances the positive charge of one proton. Both protons are neutrons have a mass of 1, while electrons have almost no mass.
The correct answer is option B.
Learn more about neutron and proton, refer:
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