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The mass of α-particle is

1. less than the sum of masses of two protons and two neutrons
2. equal to mass of four protons
3. equal to mass of four neutrons
4. equal to sum of masses of two protons and two neutron

Correct answer: less than the sum of masses of two protons and two neutrons

Solution

The mass of an α-particle (helium nucleus) is slightly less than the sum of the masses of two protons and two neutrons due to the mass defect, which accounts for the binding energy of the nucleus.

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