Question

why is it easier to break the nucleus of boron than the nucleus of iron give reason

Answer 1

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Lighter nuclei liberate energy when undergoing fusion, heavier nuclei when undergoing fission.

What is it about the nucleus of an Iron atom that makes it so stable?

Alternatively: Iron has the greatest nuclear binding energy

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Answer 2

.. In anucleus, this binding energy isstronger than the electromagnetic repulsion force that would exist if thenucleus contained more than 1 proton. The more nucleons, the stronger the total strong force is in the nucleus