Question

which of the following subatomic particles has a mass of ( 1.67\times10^{-27} kg )?
neutrons only
protons and neutrons
protons only
electrons only

Explanation:

Protons and neutrons have approximately the same mass. The mass of a proton is about \(1.67\times10^{-27}\space kg\), and the mass of a neutron is also about \(1.67\times10^{-27}\space kg\). Electrons have a much smaller mass (\(9.11\times 10^{-31}\space kg\)).

Answer:

protons and neutrons