What is true about the energy differences between electron orbitals in particular atoms?

When in a magnetic field, the two electrons in a particular orbital differ very slightly in energy because of a property called electron spin. The theory of electron spin states that the two electrons in a single orbital spin in opposite directions on their axes, causing an energy difference between them

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answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;

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