The chemical symbol for oxygen is O. Makes sense. Calcium gets repped by a Ca. Sounds good. Hydrogen? H. Cobalt? Co. Lithium? Li. With you so far. Lead? Pb. There are actually a few things that ...

State symbols close state symbol An abbreviation used in brackets in a chemical equation to show whether a substance is a solid (s), liquid (l), gas (g) or dissolved in water (aq).