I dont have a legacy version, and the normal one doesnt usually work for other people, but @Jacob1 has a working older version. The version he compiled still has a few bugs, but you can still do realistic reactions.
what does your mod have exactly
look on his mod thread.
i have and i cant find it
That can actually happen, with beta capture.
to add a touch of realism, electrons with a high temp should do this.
The best way (I think) to add new elements is to add them in sets. If Protons could only be obtained or generated from other elements with a secound new elemement, it wouldn't break anything. Complimenting that, protons could still have as many reactions with other elements we want, and they wouldn't break anything.