Which of the following is the general electronic configuration of transition elements?

  • A
    $(n - 1)d^{1 - 9} ns^{1 - 2}$
  • B
    $(n - 1)d^{1 - 10} ns^{1 - 2}$
  • C
    $(n - 1)d^{1 - 10} ns^1$
  • D
    $(n - 1)d^{1 - 9} ns^2$

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