Atomic Term Symbols

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Atomic Term SymbolsHere we are considering the terms 3 D, 3 P, 3 S, 1 D, 1 P, 1 S. Interms of stability we can rank these terms as1S1P1D3S3P3D Most stableGiven that the 3 D states are most stable, which of these termscorrespond to the most stable state?
Atomic Term SymbolsSince the two p subshells are less than half filled, we wouldpredict that the 3 D 1 term corresponds to the most stablestate!Simple approach for finding the ground state term symbol forany atom:1. Find maximum value of S consistent with the PauliExclusion Principle – S = S max .2. For S = S max , find the maximum value of L consistent withthe Pauli Exclusion Principle – L = L max .3. Apply Hund’s Rules to find J for most stable state.
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Atomic Term Symbols

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