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Question

During an α-decay, the atomic number of parent element _____________ and mass number ___________ by 4.

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Solution

During an α - decay, the atomic number of the parent element is decreased by 2 and mass number is decreased by 4.
When an alpha particle is emitted from a nucleus loses two protons and two neutrons. The new element is formed that is two planes lower in the periodic table than the original element.

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