Photons and neutrinos dont have mass.
A neutron is the subatomic particle with a charge of 0 and a mass of 1 atomic mass unit.
This atomic particle is the neutron.
atomic number = number of protons = number of electrons atomic mass = mass of protons + mass of neutrons
A beta particle, which can be either an electron (β-) or a positron (β+), has a very small atomic mass of approximately 0.00054858 atomic mass units (amu) for an electron. This is significantly less than the atomic masses of protons and neutrons, which are about 1 amu each. In practical terms, the mass of a beta particle is often considered negligible compared to nucleons in atomic nuclei.
An alpha particle is a positively charged nuclear particle consisting of two protons bound to two neutrons. The atomic number of an atom decreases by 2 and the mass number decreases by approximately 4 when an alpha particle is ejected.
The atomic mass is the mass of a molecule, atomic particle or sub-atomic particle.
This atomic particle is the neutron.
A neutron is the subatomic particle with a charge of 0 and a mass of 1 atomic mass unit.
This atomic particle is the neutron.
An alpha particle is a helium-4 nucleus. It has a mass of about 4 atomic mass units.
Electron
atomic number = number of protons = number of electrons atomic mass = mass of protons + mass of neutrons
A beta particle, which can be either an electron (β-) or a positron (β+), has a very small atomic mass of approximately 0.00054858 atomic mass units (amu) for an electron. This is significantly less than the atomic masses of protons and neutrons, which are about 1 amu each. In practical terms, the mass of a beta particle is often considered negligible compared to nucleons in atomic nuclei.
atomic mass unit
A beta particle is an electron: the mass is 5.4857990946(22)×10−4amu.
An alpha particle is a positively charged nuclear particle consisting of two protons bound to two neutrons. The atomic number of an atom decreases by 2 and the mass number decreases by approximately 4 when an alpha particle is ejected.
electron