In a(n) reaction, the products are at a higher energy level than are the reactants.
select one:
a. endothermic
b. activation
c. exothermic
d. catalytic

In an endothermic reaction, the products are at a higher energy level than are the reactants.

Explanation:

ΔH = E products - E reactants.

So, for endothermic reactions, the products are at a higher energy level than are the reactants.

Kindly see the attached image.

the formula would be mgso4

mgso[subscript]4

increased stability in the completion of fluorine's outer shell.