Definitions
There is 1 meaning of the phrase
Mass Number.
Mass Number - as a noun
The sum of the number of neutrons and protons in an atomic nucleus
Synonyms (Exact Relations)
nucleon numberExample Sentences
"The mass number of carbon-12 is 12."
"The mass number of helium-4 is 4."
"Isotopes of an element have the same atomic number but different mass numbers."
"The mass number can be used to calculate the number of neutrons in an atom."
"The mass number represents the total number of protons and neutrons in an atom."
