Why are very high temperatures and pressures required for fusion to occur?

B)to overcome the repulsion between the protons in the nuclei that join  

Fusion is basically the fusion of two hydrogen atoms. Now the nucleus of the hydrogen has protons. The protons are positively charged. When you bring two protons together, what happens? They will repel. To overcome this repusion high temperature is needed. Also the atoms of the hydrogen have to be close to each other to effectively fuse.

Explanation:A, C and D all relate to fission, not fusion.

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B.) to overcome the repulsion between the protons in the nuclei that join

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the correct name for the n3 ion is azide. azide is a polyatomic anion with a -1 charge and is written as n3 -1. it consists of three nitrogen atoms bonded together. hope i . let me know if you need anything else.

i don,t know so just answer mine