The fusion rate of this element in stars between 0.5 and 3 solar masses increases rapidly in its namesake flash.
Ionized atoms of this element have emission lines called the Pickering series. The fusion rate of this element in stars between 0.5 and 3 solar masses increases rapidly in its namesake flash. This element was independently discovered by Joseph Norman and Pierre Janssen during a solar eclipse. Four hydrogen nuclei fuse into one nucleus of this element via the proton-proton chain. A carbon nucleus is made from three nuclei of this element in a process named for the fact that its nucleus is identical to an alpha particle. For 10 points, name this element that is the second most abundant in the universe, is the lightest noble gas, and has the atomic number two.
Ionized atoms of this element have emission lines called the Pickering series.
helium [or He]