Atom
• Element     Periodic table series of elements
• Valancy     series, the same outter full shell
• Isoelectronic     same outter most shell electrons
• Nucleosynthesis in population I star     elements made to iron.
• Nucleosynthesis in population II star     older, heavy elements.
• Number of / Mass of atoms of a kind = 1     
• Momentum      Mass / Speed = 1
• Crystal → physical change → observable organisation → cooling     
• Carbon chemistry     
• Hydrogen chemistry     
• Oxidation     
• Electron chain