Q3 of 94 Page 440

A molecule of hydrogen contains two protons and two electrons. The nuclear force between these two protons is always neglected while discussing the behavior of a hydrogen molecule. Why?

Generally, when we talk about nuclear forces, we restrict our measurement to femtometer(fm)which is a small unit of measurement. But when we discuss of the forces between molecules, we make our measurement in Å which is quite larger than fm. Thus we neglect the nuclear forces between the protons in a H-molecule.


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1

If neutrons exert only attractive forces, why don’t we have a nucleus containing neutrons alone?

 2

Consider two pairs of neutrons. In each pair, the separation between the neutrons is the same. Can the force between the neutrons have different magnitudes for the two pairs?

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Suppose we have 12 protons and 12 neutrons. We can assemble them to form either a 24Mg nucleus or two 12C nuclei. In which of the two cases more energy will be liberated?