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When a lithium atom in its ground state is made from a helium atom by adding a proton (and neutron) to the nucleus and an electron outside, the electron goes into an n = 2, f = 0 state rather than an n = 3, f = 0 state. This is an indication that electrons: A. obey the Pauli exclusion principle B. obey the minimum energy principle C. undergo the Zeeman effect D. are diffracted E. and protons are interchangeable |
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Answer» B. obey the minimum energy principle |
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