The atomic mass is usually measured in atomic mass units (amu), where 1 amu is defined as one-twelfth of the mass of a carbon-12 atom. >Mass of Neutron = 1.008 amu >Mass of Proton = 1.00727647 amu ...

Atomic hydrogen emits radio waves with a wavelength of 21 cm. ... The data also shows that the atomic hydrogen mass of this distant galaxy is twice that of its stellar mass.

Scientists at EPFL and AstraZeneca have developed a method to map the atomic-level structure of amorphous drugs, demonstrated on a GLP-1 receptor agonist candidate for diabetes and obesity treatment.

Atomic hydrogen can emit a particular light as it changes quantum state, ... A dense foreground elliptical galaxy located 1.8 billion light-years away has warped space-time with its mass.