The nuclear emission that can be considered having least penetrating power as well as greatest mass as regards this question is (1) an alpha particle .
- Radioactive atoms can be regarded as one having energy which is been released out spontaneously, and this do come inform of energetic subatomic particles.
- Among the given option, alpha particle has the greatest mass having a mass of 4 amu , and with least penetration power because even thick sheet of paper can stop it compare to beta and neuron.
Therefore, option 1, is correct.
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