When heavy elements such as uranium undergo fission, there is an ...

[jake]

When heavy elements such as uranium undergo fission, there is an accompanying
 
  1) loss of mass,
  2) gain of mass,
  3) no change in mass,
 
  and when light elements such as hydrogen undergo fusion, there is an accompanying
  4) loss of mass.
  5) gain of mass.
  6) no change in mass.

Question 2

If the mass per nucleon in atomic nuclei varied as shown in the fictitious plot above, then nuclear energy would be available from the element iron (atomic no. 26) by the process of nuclear
 
  1) fission.
  2) fusion.
  3) both.
  4) neither.
 
  Accordingly, krypton (atomic no. 36) would yield energy by nuclear
  5) fission.
  6) fusion.
  7) both.
  8) neither.
  9) not enough information to say.

[soda0602]

Answer to Question 1

Answer: 1, 4

Answer to Question 2

Answer: 4, 8