What would be the electronic configuration of $Cs (Z=55)$ in each case?
$(a)$ If there were three possibilities of the electron spin.
$(b)$ If the quantum number,$l$,could have the value $n$,and if all the rules governing electron configuration were otherwise valid.

  • A
    $(a) 1s^22s^32p^63s^33p^63d^{15}4s^34p^9; (b) 1s^21p^62s^22p^62d^{10}3s^23p^63d^{10}3f^{14}4s^24p^64d^{10}4f^{14}5s^1$
  • B
    $(a) 1s^32s^32p^93s^33p^93d^{15}4s^34p^95s^1; (b) 1s^21p^62s^22p^62d^{10}3s^23p^63d^{10}3f^14s^24p^6$
  • C
    $(a) 1s^32s^32p^93s^33p^93d^{15}4s^34p^9; (b) 1s^21p^62s^22p^62d^{10}3s^23p^63d^{10}3f^14s^24p^65s^2$
  • D
    $(a) 1s^32s^32p^93s^33p^93d^{15}4s^34p^95s^1; (b) 1s^21p^62s^22p^62d^{10}3s^23p^63d^{10}3f^14s^24p^65s^2$

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