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Emission of an alpha particle leads to a

1. Decrease of 2 units in the charge of the atom
2. Increase of 2 units in the mass of the atom
3. Decrease of 2 units in the mass of the atom
4. Increase of 4 units in the mass of the atom

Correct answer: Decrease of 2 units in the charge of the atom

Solution

Emission of an alpha particle (which is a helium nucleus) decreases the atomic number by 2 (charge of the atom) and the mass number by 4. Thus, the charge decreases by 2 units.

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