JEE Main202229 Jun 2022Evening ShiftPhysicsNuclear PhysicsActual
In the following nuclear reaction, D → α D 1 → β - D 2 → α D 3 → γ D 4 Mass number of D is 182 and atomic number is 74 . Mass number and atomic number of D 4 respectively will be
Options
- A174 and 71
- B174 and 69
- C172 and 69
- D172 and 71
Correct answer
A. 174 and 71
Step-by-step solution
Equivalent reaction can be written as D → D 4 + 2 α + β - + γ So, mass number of D 4 = mass number of D - 2 × 4 = 182 - 8 = 174 Atomic number of D 4 = atomic number of D - 2 × 2 + 1 = 74 - 4 + 1 = 71 The reaction is D 74 182 ⟶ α D 1 72 178 ⟶ β - D 2 73 178 ⟶ α D 3 71 174 → γ D 4 71 174