The nucleus that completes the equation given above is 218/85 At, which is option D.
What is a nuclear fission?
Nuclear fission is a nuclear reaction in which a large nucleus splits into smaller ones with the simultaneous release of energy.
According to this question, the following nuclear fission reaction is given: 222/87Fr = 4/2He+ ?
To find the missing nucleus, we subtract 4 from 222 to get 218, therefore, the nucleus that completes the equation given above is 218/85 At.
Learn more about nuclear fission at: https://brainly.com/question/913303
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