The last element of the $p$-block in the $6$th period is represented by which outermost electronic configuration?

  • A
    $7 s^2, 7 p^6$
  • B
    $5 f^{14}, 6 d^{10}, 7 s^2, 7 p^5$
  • C
    $4 f^{14}, 5 d^{10}, 6 s^2, 6 p^4$
  • D
    $4 f^{14}, 5 d^{10}, 6 s^2, 6 p^6$

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