An element has atomic number 10 and an atomic mass of 20. How many neutrons are in the atom of this element? OA.
10
OB.
20
O C.
30
D. 0
O E. 200

10

subtract the atomic mass from the atomic number

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.