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The mass numbers of four different elem...

The mass numbers of four different elements A, B, C and D are 2, 35, 135 and 239 respectively. Which of them would provide the most suitable fuel for (i) nuclear fission, and (ii) nuclear fusion?

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(i) In the process of nuclear fussion, a very big atom (having a very big mass number) is used as a fuel. Here, out of the four elements A, B, C and D, the atom of element D is the biggest, having a mass number of 239. So, element D would provide the most suitable fuel for nuclear fission.
(ii) In the process of nuclear fusion, a very small atom (having a very small mass number) is used as a fuel. Here, out of the four elements A, B, C and D, the atom of element A is the smallest, having a mass number of 2. So, element A would provide the most suitable fuel for nuclear fusion.
Before we go further and discuss the consequences of using energy sources on the environment.
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