Question

What is the combined number of protons and neutrons called?

Answer 1

We have to know that protons are a kind of subatomic molecule with a positive charge. Protons are bound together in a particle's core because of the solid atomic power. Neutrons are a kind of subatomic molecule with no charge. Therefore, an unbiased particle should have an equivalent number of protons and electrons.

Complete answer:
We have to know that the mass number $\left( A \right)$ of a particle is the complete number of protons and neutrons in its core. The mass of the particle is a unit called the nuclear mass unit (amu). One nuclear mass unit is the mass of a proton, or about $1.67 \times {10^{ - 27}}$ kilograms, which is a tiny mass. A neutron has recently a smidgen more mass than a proton, yet its mass is frequently thought to be one nuclear mass unit also. Since electrons have basically no mass, pretty much all the mass of a particle is in its protons and neutrons. Along these lines, the absolute number of protons and neutrons in a molecule decides its mass in nuclear mass units.
For what reason do you feel that the mass number incorporates protons and neutrons, however not electrons? You realize that a large portion of the mass of a molecule is gathered in its core. The mass of a molecule relies upon the quantity of protons and neutrons. You have effectively discovered that the mass of an electron is incredibly, little contrasted with the mass of either a proton or a neutron. Checking the quantity of protons and neutrons educates researchers concerning the complete mass of an atom.
$Mass{\text{ number(A) = No}}{\text{. of protons + No}}{\text{. of neutrons}}$

Note:
We have to know that, most helium particles have two neutrons notwithstanding two protons. In this manner the mass of most helium particles is four nuclear mass units. In any case, some helium molecules have more than two neutrons. Molecules with similar numbers of protons however various quantities of neutrons are called isotopes.