A neutron is combined in a nuclear reaction with a proton to make a heavy hydrogen nucleus. This nucleus then acquires electron(s) to become electrically neutral.

This nucleus then acquires one electron to become electrically neutral.

Explanation:

Fusion :It is nuclear reaction which two or more than smaller nuclei combines together to form heavy nuclear.

A neutron combines with proton in order to make heavy electron that is fusion reaction is taking place.

The overall charge in the nucleus will be +1.And in order to neutralize this positive charge the nucleus will acquire single electron to become electrically neutral.

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