In a nuclear fusion reaction, the mass of the products is less than the mass of the reactants. What happens to this "missing mass"? A. It turns into matter. B. It turns into energy. C. It turns into antimatter. D. It turns into matter and antimatter.

• swishswish: In a nuclear fusion reaction, the mass of the products is less than the mass of the reactants. This "missing mass" -turns into energy.
• erinna:

  Answer: Option B; it turns into energy

  In a nuclear fusion reaction, two reactants combine, and form new products. But the mass of the products is less than total mass of the reactants. This is because a part of mass is lost as energy. This can be seen in an example shown below. You can see that mass is of the products is less than that of the reactants.