atomic mass

"Many thousands of atomic nuclei that have yet to be measured may exist in nature," said Matthew Mumpower, a theoretical physicist and co-author on several recent papers detailing atomic masses research.

When we refer to light or heavy elements, we're talking about their atomic mass.

Wallner is particularly interested in the radioactive iron isotope with the atomic mass of 60.

Twelve, named for the atomic mass of carbon, has developed a process to make jet fuel using renewable electricity, water and waste biomass CO2 instead of fossil fuels.

A silvery, alkaline earth metal called strontium comes in different versions, or isotopes, each with a different atomic mass.