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In the disintegration of a radioactive e...

In the disintegration of a radioactive element, `alpha`- and `beta`-particles are evolved from the nucleus.
`._(0)n^(1) rarr ._(1)H^(1) + ._(-1)e^(0) +` Antineutrino + Energy
`4 ._(1)H^(1) rarr ._(2)He^(4) + 2 ._(+1)e^(0) +` Energy
Then, emission of these particles changes the nuclear configuration and results into a daughter nuclide. Emission of an `alpha`-particles results into a daughter element having atomic number lowered by 2 and mass number by 4, on the other hand, emission of a `beta`-particle yields an element having atomic number raised by 1.
How many `alpha`- and `beta`-particle should be emitted from a radioactive nuclide so that an isobar is formed? a)`1 alpha, 1 beta` b)`1 alpha, 2 beta` c)`2 alpha, 2 beta` d)`n beta`

A

`1 alpha, 1 beta`

B

`1 alpha, 2 beta`

C

`2 alpha, 2beta`

D

`nbeta`

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