which best describes nuclear fusion?\na nucleus spontaneously splits and absorbs energy.\ntwo nuclei…

which best describes nuclear fusion?\na nucleus spontaneously splits and absorbs energy.\ntwo nuclei spontaneously combine and absorb energy.\na nucleus collides with a neutron and splits, releasing energy.\nnuclei combine to form a heavier nucleus, releasing energy.

which best describes nuclear fusion?\na nucleus spontaneously splits and absorbs energy.\ntwo nuclei spontaneously combine and absorb energy.\na nucleus collides with a neutron and splits, releasing energy.\nnuclei combine to form a heavier nucleus, releasing energy.

Answer

Brief Explanations:

Nuclear fusion is the process where two light - weight nuclei combine to form a heavier nucleus, and this releases a large amount of energy. The first option describes nuclear fission (a nucleus splitting). The second option is incorrect as fusion releases energy, not absorbs. The third option also describes fission (nucleus splitting after neutron collision).

Answer:

Nuclei combine to form a heavier nucleus, releasing energy.