The atomic mass of an element is
a. a weighted average of the masses of an element’s isotopes.
b. twice the number of protons in one atom of the element.
c. the sum of the protons and neutrons in one atom of the element.
d. a ratio based on the mass of a carbon-12 atom.

explain

Which type of reaction is shown in this energy diagram? energy products activation energy reactants time o a. endothermic, because energy is released to the surroundings o b. exothermic, because energy is absorbed from the surroundings o c. exothermic, because energy is released to the surroundings o d. endothermic, because energy is absorbed from the surroundings