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Atomic Number

During an α...

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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