It contains 197 nucleons, of which 79 are protons
and the rest118 are neutrons Rationalised 2023-24
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Nuclei
The composition of isotopes of an element can now be readily
explained The nuclei of isotopes of a given element contain the same
number of protons, but differ from each other in their number of neutrons Deuterium, 2
1 H, which is an isotope of hydrogen, contains one proton
and one neutron