Question

Emission of an alpha particle leads to a

• A. decrease of 2 units in the charge of the atom
• B. increase of 2 units in the mass of the atom
• C. decrease of 2 units in the mass of the atom
• D. increase of 4 units in the mass of the atom

Answer 1

Answer: (A)

When an alpha particle is emitted from a
radioactive element, then its atomic number is
decrease by 2 units and mass number is decrease by
4 units.
${}_{84}P{o}^{210}{⟶}_{82}P{o}^{206}{+}_{2}H{e}^4$