Question

When is the spin of an electron changing?

Answer 1

According to the Pauli Exclusion principle, no to Fermions in an atom can exist in the same quantum state. ... So, to keep existing in the higher energy state, the electron e1 has to change it's quantum state so that it is not similar to e2. To do this, the electron changes it's spin.

Answer 2

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It is correct that the orientation of the electron spin can be changed.

It is incorrect to describe a single electron as paramagnetic or diamagnetic. These are properties of bulk materials, not individual electrons.
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