Which element could not form in the sun and would have to be formed in a supernova?

a. hydrogen (atomic number 1)

b. helium (atomic number 2)

c. oxygen (atomic number 8)

d. uranium (atomic number 92)

(i think its physical science but i didnt see it so i just put chemistry)

Predict the reactants of this chemical reaction. that is, fill in the left side of the chemical equation. be sure the equation you submit is balanced. (you can edit both sides of the equation to balance it, if you need to.) note: you are writing the molecular, and not the net ionic equation. > cacl2(aq) + h20(l)