GENERAL KNOWLEDGE

Detailed explanation-1: -The most common isotope of iron, iron-56, is thought to be the most stable nucleus since it has the lowest mass per nucleon of all nuclides. Iron-56 is also a strongly and effectively bound nucleus, having a binding energy of.

Detailed explanation-2: -Answer and Explanation: Tin has the most stable isotopes of all the elements.

Detailed explanation-3: -Iron has four naturally-occurring stable isotopes, 54Fe, 56Fe, 57Fe and 58Fe. The relative abundances of the Fe isotopes in nature are approximately 54Fe (5.8%), 56Fe (91.7%), 57Fe (2.2%) and 58Fe (0.3%).

Detailed explanation-4: -Iron-57 isotope is used for studies of hydrogen diffusion in metals; Iron-57 isotope is used for studies of magnetic compounds (e.g. studies of materials with high Curie temperatures and electron mobility, magnetic semiconductors, magnetic isotope doped amorphous materials);