MCQ
When an alpha particle is emitted from a radioactive source:
- AIts atomic number increases by $4$
- ✓Its atomic number decreases by $2$
- CIts atomic number increases by $2$
- DIt atomic number decreases by $4$
✓
Answer
Correct option: B.
Its atomic number decreases by $2$
When an alpha particle is emitted from a radioactive source or substance, its atomic number decreases by $2$ and its atomic mass decreases by $4$, which is same as that of helium ion.
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