Compare and contrast nuclear fusion and fission. explain what occurs in these reactions and what types of atoms are involved. also discuss two safety issues that arise with nuclear fission and fusion and what kinds of conditions are needed to start these reactions

As the name suggests, nuclear fusion involves combination of nuclei to produce energy e. g. the sun's surface has hydrogen nuclei combined with helium producing the energy, whilst nuclear fission is the event where an unstable nucleus is split producing energy along. In fission, melt-down is an issue to watch out for whilst not considered as a safety concern in nuclear fusion. A controlled environment for both is essential for the two reaction.