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Sep 19, 2024 · The mass number is the total number of protons and neutrons present inside the nucleus of an atom. It represents the mass of the atom. Mass number = Number of protons + Number of neutrons. Example: A carbon atom with 6 protons and 6 neutrons will have a mass number of 12.
Aug 26, 2024 · Explain what isotopes are and how an isotope affects an element's atomic mass. Determine the number of protons, electrons, and neutrons of an element with a given mass number.
The mass number is defined as the total number of protons and neutrons in an atom. It can be calculated by adding the number of neutrons and the number of protons (atomic number) together. Mass number = atomic number + number of neutrons. Consider Table \(\PageIndex{1}\) below that shows data from the first six elements of the periodic table.
An element’s mass number is the sum of the number of protons and neutrons in its nucleus. So the most common form of carbon’s mass number is 12. Electrons have so little mass that they do not appreciably contribute to the mass of an atom.
- Lindsay M. Biga, Sierra Dawson, Amy Harwell, Robin Hopkins, Joel Kaufmann, Mike LeMaster, Philip Mat...
- 2019
An isotope of any element can be uniquely represented as A Z X, where X is the atomic symbol of the element, A is the mass number and Z is the atomic number. The isotope of carbon that has 6 neutrons is therefore 12 6 C.
The total number of protons and neutrons in an atom is called its mass number (A). The number of neutrons is therefore the difference between the mass number and the atomic number: A – Z = number of neutrons.
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The mass number (symbol A, from the German word: Atomgewicht, "atomic weight"), [1] also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. It is approximately equal to the atomic (also known as isotopic) mass of the atom expressed in atomic mass units.
