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Question
The nucleus of an atom does not contain electrons. Explain how is it possible for the nucleus to emit a beta particle which is fast moving electron.
Solution
The nucleus emits a beta particle when a neutron inside it changes into a proton. The reaction is
\[\ce{\underset{\text{neutrons}}{_0^1n} -> \underset{\text{proton}}{_1^1p} +\underset{\text{β-paricles}}{_-1^0e} +\underset{\text{anti-neutrino}}{V}}\]
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