The total mass of the protons and neutrons in an atom is called the?

Answer 1

The sum of the number of protons and neutrons in the atomic nucleus is called the "mass number".

For example, Lithium has 3 protons and 4 neutrons in its nucleus. It's mass number is 7 (3+4). The mass number usually goes in front of the atomic symbol and in superscript, such as 7Li.

The protons and neutrons, which are called nucleons when they are talked about as the components of an atomic nucleus, add up to make the atomic mass of an atom. Strictly speaking, the electrons are included, but they weigh next to nothing, being about 1/1836th the mass of a proton. That lets us use as the Atomic Mass the number of nucleons in the nucleus of the atom.

If all of the atomic masses of atoms of a given element are averaged, the result is the element's atomic weight. These terms are often confused and thus special care must be taken when using them.

Answer 2

Protons + Neutrons add up to the mass number of the element. This is a given number and not located on the Periodic Table. However, the (non-single digit) number on the periodic table is referred to as the Atomic Mass which is the average of the relative abundance of all isotopes of that single element.

Answer 3

a total count of the neutrons and protons in an atom is the mass number.

Answer 4

The total number of protons and neutrons in an atoms is the mass number of the atom.

Answer 5

atomic number

Answer 6

the atomic weight

Answer 7

mass number