A nucleus of a radioactive element emits an ${\alpha ^ - }$particle, then a ${\beta ^ - }$ particle and then another ${\beta ^ - }$ particle.
Which statement describes the final element that is produced?
1 )
It is a different element of higher proton number than the original element.
2 )
It is a different element of lower nucleon number than the original element.
It is an isotope of the original element.
4 )
It is the same element as the original element but with a different proton number.
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