Hello! I don't know if I'm in the right section here, but this one matched most.
ELEC + NEUT --> HYGN, but I think it another "reaction" would be better, because in real life hydrogen consists of other "elements":
ELEC + proton would be HYGN; so we need a new type of element: PROT
ELEC + NEUT + PROT would be heavy hydrogen (deuterium) and its shortcut should be DEUT, although it's already reserved for D2O, heavy water. Maybe HWTR or DTOX would be better names for it.
DEUT + OXYG would then be DTOX
Perhaps alpha-particles could be implemented too. Symbol: ALPH
NEUT + PROT --> ALPH
The filling height of water doesn't balance out; this seems to be not implemented yet.
I would be very happy if these changes could be made :)