Question
Write expected and observed electronic configurations of
(i) $Ce$
(ii) $Tb$.
(i) $Ce$
(ii) $Tb$.
| Element | Expected (Idealised) | Observed |
| (i) ${ }_{58} Ce$ | $[ Xe ] 4 f^1 5 d^1 6 s^2$ | $[ Xe ] 4 f ^2 5 d ^{\circ} 6 s ^2$ |
| (ii) $65 Tb$ | $[ Xe ] 4 f^8 5 d^1 6 s^2$ | $[ Xe ] 4 f^9 5 d^{\circ} 6 s^2$ |
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