Question

What happens to the atomic number of an element when an $\alpha$-particle, is emitted?

• A. Decreases by $2$
• B. Increases by $2$
• C. Decreases by $4$
  
• D. Increases by $4$
  

Answer 1

The correct option is A Decreases by $2$

The emission of an alpha particle from a nucleus reduces the mass number of the nucleus by $4$ and the atomic number by $2$.