What is the sum of the number of protons and neutrons in the nucleus of an atom called?

Mass Number Protons and neutrons are collectively called called nucleons. The number of nucleons (protons plus neutrons) in the nucleus of an atom 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 7 Li The answer is not atomic mass or atomic weight. Although atomic mass and atomic weight are slightly different measures, they both describe averages. To determine the total number of nucleons in an atom, you need to isolate a specific isotope and add together the number of protons and neutrons See the Related Questions below for how to find the number of protons, neutrons and electrons in any atom.

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 7 Li 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.

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