These particles are proton and neutron.
This atomic particle is the neutron.
Mass of electron is not included for the calculation of mass of an atom.
The atomic mass is the mass of a molecule, atomic particle or sub-atomic particle.
The atomic number increases but the atomic mass stays the same after the emission of a beta particle by a radioactive atom.
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 proton and neutron - both with a relative atomic mass of 1.
The largest subatomic particle (by mass) is the proton. The mass of subatomic particles is measured in atomic mass units (amu). The proton has a mass of 1.007 amu, the neutron has a mass of 1 amu, and the electron has a mass of .0005 amu.
Either a proton or neutron has an atomic mass of 1. An electron's mass is actually extremely small in comparison. The majority of the weight of an atom is in the nucleus.
Emiting a beta particle is the result of a neutron changing into a proton so the atomic number increases by 1 and the mass number stays the same
If an atom looses an electron, neither the atomic mass nor atomic weight change appreciatively. If it looses a proton or neutron, both atomic mass and atomic weight decrease by one and it becomes an atom of a different element (on loss of a proton), or a different isotope of the same element (upon loss of a neutron).
We make atomic number by number of protons in a atom. We make mass number by total of both protons and neutrons.
Proton + Nuetron = Atomic Mass