On a standard nuclide chart, the drip line for these objects is the closest drip line to the "A equals Z" line.
On a standard nuclide chart, the drip line for these objects is the closest drip line to the "A equals Z" line. This thing combined with a lighter thing during cosmological recombination. Most cosmic rays are these things, which are the stablest baryons, and which are about 1836 times heavier than the heaviest first-generation lepton. Unsuccessful experimental efforts to observe the decay of this particle have included Super-Kamiokande. A "chain" reaction named for these particles generates most of the sun's energy. The number of these in an atom is typically denoted "Z" and is called the atomic number. For 10 points, name this positively-charged nuclear particle. 
On a standard nuclide chart, the drip line for these objects is the closest drip line to the "A equals Z" line.
protons [or hydrogen-1 nuclei; or protium nuclei; prompt on "hydrogen"]