Electron Configurations

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12 Terms

1
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Order of orbital filling up to Calcium

1s → 2s → 2p → 3s → 3p → 4s → 3d → 4p

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Maximum electrons in an s orbital

2 electrons

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Maximum electrons in a p orbital

6 electrons

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Maximum electrons in a d orbital

10 electrons

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Maximum electrons in an f orbital

14 electrons

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Which orbital fills first, 4s or 3d?

4s fills before 3d

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s orbital

l=0 → mₗ = 0

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p orbital

l=1 → mₗ = -1, 0, +1

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d orbital

l=2 → mₗ = -2, -1, 0, +1, +2

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f orbital

l=3 → mₗ = -3, -2, -1, 0, +1, +2, +3

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spin quantum number

The electron's spin, which can be +½ or -½.

12
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orbital electron capacity

Max 2 electrons per orbital, with opposite spins (+½ and -½).