How much is a neutron?
Table of Contents
Neutron
The quark content of the neutron. The color assignment of individual quarks is arbitrary, but all three colors must be present. Forces between quarks are mediated by gluons. | |
---|---|
Classification | Baryon |
Mass | 1.67492749804(95)×10−27 kg 939.56542052(54) MeV/c2 1.00866491588(49) Da |
Mean lifetime | 879.4(6) s (free) |
Are all protons the same size?
So the theoretical answer is – there is a discrete set of masses (and sizes) for the proton and neutron. In practice they decay from such states to their ground state, so the practical answer is – all protons and neutrons are found in exactly the same size and mass.

Is a neutron large or small?
neutron, neutral subatomic particle that is a constituent of every atomic nucleus except ordinary hydrogen. It has no electric charge and a rest mass equal to 1.67493 × 10−27 kg—marginally greater than that of the proton but nearly 1,839 times greater than that of the electron.
Can a neutron exist by itself?
Although the term is not used in the scientific literature either for a condensed form of matter, or as an element, there have been reports that, besides the free neutron, there may exist two bound forms of neutrons without protons.
Where is a neutron located?

inside the nucleus
Neutrons
Particle | Symbol | Location |
---|---|---|
proton | p+ | inside the nucleus |
electron | e− | outside the nucleus |
neutron | n0 | inside the nucleus |
Is the mass of a proton 1?
Protons have a positive electrical charge of one (+1) and a mass of 1 atomic mass unit (amu), which is about 1.67×10−27 kilograms.
Is a proton Big or small?
This figure is smaller than all previous measurements made, which ranged between 0.8768 and 0.897 femtometer. (Either way, the proton is a lot smaller than even a hydrogen atom: if the atom were the size of a football field, the proton would be the size of an ant.)