On Earth it is relatively rare—5.2 ppm by volume in the atmosphere. Most terrestrial helium<span> present today is created by the natural radioactive decay of heavy radioactive elements (thorium and uranium, although there are other examples), as the alpha particles emitted by such decays consist of </span>helium<span>-4 nuclei.</span>
D I think pls don’t get mad if it’s wrong lol
KCl2 (potassium dichloride) ?I’m not completely sure
pH. 10 because it is strong base
