Define chain reaction in terms of the fission of uranium nucleus. Chain reactions are reactions in which neutrons produced by the alpha decay of one uranium nucleus induce fission in other uranium nuclei. neutrons produced by the fission of one uranium nucleus induce fission in other uranium nuclei. neutrons produced by the fission of one uranium nucleus prevent fission in other uranium nuclei. neutrons produced by the fusion of one uranium nucleus induce fission in other uranium nuclei.

so what is the problem with your lab report and whats the subject of the lab report? i will you

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.