Which statement is incorrect from the following?

  • A
    $CrO$ is basic,but $Cr_2O_3$ is amphoteric
  • B
    $Cd$ is not considered as a transition element
  • C
    Atomic sizes of elements of the $4d$ series are greater than corresponding elements of the $3d$ series
  • D
    Atomic sizes of elements of the $5d$ series are greater than corresponding $4d$ series

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