A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

What is the mass number of an atom?

Best Answers

The mass number (symbol A, from the German word Atomgewichte (atomic weight), 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 determines the atomic mass of atoms. read more

The Mass Number (= Nucleon Number) of an atom is not necessarily the same as the Relative Atomic Mass of that element. The Mass Number (of the atoms) is only the same as the Relative Atomic Mass (of the element) when all the the atoms of the element are the same, that is when the element has only one isotope. read more

A mass number is the total number of protons and neutrons found in an atom. To find the mass number, you must know the number of neutrons in that particular isotope of the element and then add the atomic number (same as the number of protons) to it. read more

Encyclopedia Research

Wikipedia: