Isotopes that are above or below the band of stability undergoes different radioactive processes.
The question is incomplete but I will try to help to help you the much I can. The stability of isotopes is determined by the neutron - proton ratio. If the neutron- proton ratio is greater than 1.5 or less than 1.0, the atom is said to be above or below the band of stability respectively.
The isotopes that are found within the band of stability do not undergo any spontaneous radioactive process. However, isotopes that are above or below the band of stability undergoes different radioactive processes.
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