What is proton, how does it differ from a neutron?
Hint: We know that a neutrino is a subatomic particle that is very similar to an electron, but has no electrical charge and a very small mass, which might even be zero. Neutrinos are one of the most abundant particles in the universe because they have very little interaction with matter, however, they are incredibly difficult to detect.
Complete answer: We know that the proton is an elementary particle that is identical with the nucleus of the hydrogen atom, that along with the neutron is a constituent of all other atomic nuclei, that carries a positive charge numerically equal to the charge of an electron. The protons inside an atom's nucleus help bind the nucleus together. They also attract the negatively charged electrons, and keep them in orbit around the nucleus. The number of protons in an atom's nucleus determines which chemical element it is. Millions of neutrinos coming from nuclear reactions in the Sun pass through our body every day without ill effect. The reason is that their interaction with human tissue is next to zero. All charged particles, like electrons, protons, etc. do interact and in sufficient quantities can be harmful. Neutrinos are created by various radioactive decays; the following list is not exhaustive, but includes some of those processes: beta decay of atomic nuclei or hadrons, natural nuclear reactions such as those that take place in the core of a star. Therefore, protons are positively charged particles found in the atoms of all the elements whereas a neutron is a neutral particle found in the nucleus of an atom.
Note: Remember that the photon is sometimes referred to as a quantum of electromagnetic energy. Photons are not thought to be made up of smaller particles. For instance, if photons weigh nothing at all, they would be completely stable and could theoretically last forever. But if they do have a little mass, they could eventually decay into lighter particles. That lifetime may sound like an eternity, but to a photon traveling at light speed; it passes in a relative blink.