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The mass of a nucleusZ A X is less than the sum of masses of (A-Z) number of neutrons and Z number of protons in the nucleus. The energy equivalent to the corresponding mass difference is known as the binding energy of the nucleus. A heavy nucleus of mass M can break into two light nuclei of masses m 1 and m 2 only if (m 1 + m 2 ) < M. Also two light nuclei of masses m 3 and m 4 can undergo complete fusion and form a heavy nucleus of mass M′ only if (m3 + m4 ) > M′ . The masses of some neutral atoms are given in the table below :
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The mass of a nucleus
| 1.007825u | 2.014102u | 3.016050u | | 4.002603u | ||||||||||
6.015123u | 7.016004u | | 69.925325u | 81.916709u | |||||||||||
| 151.919803u | | 205.974455u | | 208.980388u | | 209.982876u |
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