A nucleus, absorbing a neutron, emits an...

A nucleus, absorbing a neutron, emits an electron to go over to neptunium which on futher emitting an electron goes over to plutonium. How would you represent the resulting plutonium?

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The successive processess may be expressed as
.`_(92)U^(238) overset (._(0)n^(1)) rarr. _(92)U^(239) overset (beta (electron)) rarr. _(93)Np^(239)`
overset(beta(electron)) rarr ._(94)Pu^(239)`
Thus, the resulting plutonium has atomic number 94 and mass number `239` and is expressed as `._(94)Pu^(239)`.

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