4f configuration of a lanthanoid or its ion (filled, half-filled, f0, f7, f14)

1. A.
   Ce
2. B.
   La
3. C.
   Gd
4. D.
   Eu

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1. A.
   Gd
2. B.
   Sm
3. C.
   Nd
4. D.
   Ho

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1. A.
   Sm
2. B.
   Pr
3. C.
   Lu
4. D.
   Dy

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1. A.
   W
2. B.
   Yb
3. C.
   Eu
4. D.
   Cd

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1. A.
   Ce
2. B.
   Yb
3. C.
   Eu
4. D.
   Tb

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1. A.
   Eu
2. B.
   Tb
3. C.
   Ce
4. D.
   Lu

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1. A.
   7
2. B.
   5
3. C.
   4
4. D.
   0 (zero)

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1. A.
   La
2. B.
   Yb
3. C.
   Eu
4. D.
   Gd

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1. A.
   Tm
2. B.
   Lu
3. C.
   Ce
4. D.
   Dy

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1. A.
   $[\mathrm{Xe}]\,4f^3\,5d^0\,6s^2$
2. B.
   $[\mathrm{Rn}]\,5f^4\,6d^1\,7s^2$
3. C.
   $[\mathrm{Xe}]\,4f^7\,5d^1\,6s^2$
4. D.
   $[\mathrm{Xe}]\,4f^0\,5d^1\,6s^2$

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