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21.8 Converting Mass to Energy: Mass Defect and
The maximum is 60.
The most stable are those with mass numbers of 60 or more.
The binding energy per nucleon decreases again.
The binding energy per nucleon increases when a heavy nucleus is broken up into smaller nuclei.
This is similar to a chemical reaction in which weak bonds break and strong bonds form.
In both cases, the process is cold.
To form a heavier nucleus is exothermic as well.
Both fusion and fission form nuclides with higher binding energies than the parent nuclides, so they emit large amounts of energy.
The basis of hydrogen bombs is nuclear fusion.
A hydrogen bomb is 1000 times more powerful than the first atomic bombs.
High temperatures are required because fusion reactions require two positively charged nuclei to come together.
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