1 atomic unit
Neutrons have the same mass as that of a proton. Neutrons and protons are present in the nucleus
No; the mass of proton is similar to the mass of neutrons.
Thr proton has a similar mass.
Proton
No. The mass of neutrons and protons are about the same. The mass of an electron is about 1/1800th the mass of a proton.
Protons and neutrons have almost the same mass.
No two subatomic particles have the exact same mass. The proton and the neutron, however, come close. Neutrons are heavier than protons by only 2.3 X 10-30 kg. (Neutron: 1.674927351 x 10-27, Proton: 1.672621777 x 10-27)
The mass number is (by definition) the total sum of proton and neutron number in the nucleus of one particular isotope of an element.
A neutron and a proton have approximately the same mass.
Neutrons
just a bit heavier than a proton.
Slightly more than that of a proton plus an electron.