Ground-state electronic configuration or f-electron count of a lanthanoid or actinoid atom

1. A.
   A and B only
2. B.
   A and E only
3. C.
   $C$ and D only
4. D.
   B and D only

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1. A.
   $\lbrack Xe\rbrack 4f^{4}6{\text{ }s}^{2}$
2. B.
   $\lbrack Xe\rbrack 5f^{4}7{\text{ }s}^{2}$
3. C.
   $\lbrack Xe\rbrack 4f^{6}6{\text{ }s}^{2}$
4. D.
   $\lbrack Xe\rbrack 4f^{1}5{\text{ }d}^{1}6{\text{ }s}^{2}$

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1. A.
   $\lbrack Rn\rbrack 5f^{12}6{\text{ }d}^{0}7{\text{ }s}^{2}$
2. B.
   $\lbrack Rn\rbrack 5f^{11}6{\text{ }d}^{0}7{\text{ }s}^{2}$
3. C.
   $\lbrack Rn\rbrack 5f^{13}6{\text{ }d}^{0}7{\text{ }s}^{2}$
4. D.
   $\lbrack Rn\rbrack 5f^{10}6{\text{ }d}^{0}7{\text{ }s}^{2}$

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1. A.
   (B) and (C) Only
2. B.
   (A) and (B) Only
3. C.
   (A) and (D) Only
4. D.
   (A) and (C) Only

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