A nucleus X is radioactive and decays into a nucleus Y.
X and Y are isotopes of the same element.
Which combination of particles could have been emitted during the decay process?
1 )
1 α-particle and 1 β$^-$ particle
1 α-particle and 2 β$^-$ particle
3 )
2 α-particle and 1 β$^-$ particle
4 )
2 α-particle and 2 β$^-$ particle
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