After emitting alpha particle, the mass of the atom

Options :
  1. increases and its at. number decreases
  2. decreases and its at. number decreases
  3. remains same
  4. none of the above
Answer and Explanation :-

Answer: Option 2

Explanation:

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Real life is messy, inconsistent, and it's seldom when anything ever really gets resolved. It's taken me a long time to realize that.
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