A) Electron
B) Proton
C) Neutron
D) \[\alpha \]-particle
Correct Answer: C
Solution :
(a) Electron revolves around the nucleus of an atom. It is a stable particle. (b) Proton has positive charge and its mass is 1836 times the electronic mass. In free state, the proton is a stable particle. (c) Neutron carries no charge. Its mass is 1839 times the electronic mass \[(1.675\times {{10}^{-27}}\,kg.)\] In free state the neutron is unstable (its mean life is about 17 min), but it constitutes a stable nucleus along with proton. (d) \[\alpha -\]particle is helium nucleus whose atomic number is 2 and mass number is 4. Hence, out of the given four options neutron is most unstable.
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