Neutron (_on¹, N)

(1) Neutron was discovered by James Chadwick (1932) according to the following nuclear reaction, ₄Be⁹ + ₂He⁴ → ₆C¹² + _on¹ or ₅B¹¹ + ₂He⁴ → 7N14 + _on¹ 

(2) Neutron is an unstable particle. It decays as follows,

          _on¹         → ₁H¹ +     _-1e⁰ +       ₀v⁰

         neutron    Proton      electon    antinutrin o