I didn't know where to post this but I'm going to ATTEMPT to make a full list of every element/mechanic that has been rejected so that it is super easy to look at and see if it has been mentioned before. I'll even put it in Alphabetical order if I get the time.
Alright, thanks. Btw It will take a while to get this list completed so don't expect it to be done before the end of the week. Here is what I have so far, tell me if you see any that I misspelled or is incorrect.
Ozone Gold Powdered White Hole Magnatism/ElectroMagnatism Irradiation Paper Convection Solid Oxygen Wolframium Titanium Lava evaporate at high temp Wood break to Dust Sugar Iron Ore Cloth Tile Capacitor Base Virus Radio Waves Cloud Tungsten Aluminium Rope/cable Potassium Lead Cardboard Food Wool Pyrex Francium Mud Dirt Mirrors Lamp Solar Panels Magnesium Seeds Copper Steel Bubbles Rubber Wheels Propane Hydrogen Sulphide Timed Battery Zombies Resistor Lightning Rod Alpha/Beta/Gamma/Xray Radiation Neon Gases Light Tiberium Sun Aluminum Oxide Electrons Crushed Diamond Petrol Stars Freon Poison Liquid Void Superball Parafin Quarks Animals/Creatures Pressure Wall Movable Solids Glue
Btw I think the list should be reviewed every once in a while by a Dev since as time goes on some elements will probably become useful or possible.