Synthesizing the Chemical Elements

Elements # of Protons Production Site
Hydrogen 1 Big Bang
He 2 Big Bang + stars
Carbon, Oxygen 6, 8 low- and high-mass stars
Neon - Fe 10 - 26 high-mass stars
Cobalt - Bismuth 27 - 84 s- and r-process; AGB and SNe
Polonium - Uranium 84 - 92 r-process in SNe