Why is a nuclear fusion reaction called a thermo nuclear reaction

Modern Physics (10)

(i) Why is a nuclear fusion reaction called a thermo nuclear reaction?

(ii) Complete the reaction:

³He₂ + ²H₁ → ⁴He₂ + .... + Energy

Answer

(i) It requires extremely high temperature to take place.

(ii) ³He₂ + ²H₁ → ⁴He₂ + ¹H₁ + Energy

Apply the principle of conservation of mass number and atomic number in completing the reaction.