Among the following , $- ------- -$ is unstable in free space.

Electron

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Proton

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Neutron

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α

-particle

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Solution

The correct option is D Neutron
Neutron is unstable in free space. It undergoes this reaction in free space:
neutron $\to$ proton + $β$ particle + anti nutrino
$_{0}^{1} n \to_{1}^{1} H +_{- 1}^{0} e + ¯ v$
Electron, proton and $α$ - particle are stable in free space.

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Similar questions

The unstable halide among the following is

(α, β, γ)

x

Column-I	Column-II
$(A)$ $_{6}^{14} C$	$(i)$ Unstable and $β$ -emitter
$(B)$ $_{11}^{24} N a$	$(i i)$ Stable
$(C)$ $_{7}^{13} N$	$(i i i)$ Unstable, positron emitter
$(D)$ $_{6}^{13} C$	$(i v)$ Unstable, $α$ -emitter

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