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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 _____

1. 174 and 71
2. 174 and 69
3. 172 and 69
4. 172 and 71

Correct answer: 174 and 71

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