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| Abbreviated electron |
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| configuration |
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| • | 2He 1s2 |
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| • | 10Ne 1s22s22p6 |
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| • | 18Ar 1s22s22p63s23p6 |
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| • | 36Kr 1s22s22p63s23p64s23d104p6 |
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| • | These
configurations are for ground state |
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| configurations--lowest
energy. |
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