Why nuclear fusion results in energy?

Question

So every other kind of energy we can get is from splitting molecules (combustion) or splitting atoms (fission)
So how come we can get energy from fusing atoms together?

In: Physics

Answer 1

For fission and fusion, iron is the line where it switches. Breaking apart atoms heavier than iron release energy, but fusing atoms smaller than iron also releases energy. Combustion and such are all chemical processes and involve electric bonds, whereas the nuclei are a different force altogether.