MCQ
If the principal quantam number $n=6,$ the correct sequence of filling of electron will be
  • A
    $ns \to  (n - 2)f \to  np \to  (n - 1 )d$
  • $ns \to  (n - 2)f\to (n -1 )d\to  np$
  • C
    $ns \to  np \to  (n - 1 )d \to  (n-2)f$
  • D
    $ns \to  (n-1 )d \to  (n-2)f \to  np$

Answer

Correct option: B.
$ns \to  (n - 2)f\to (n -1 )d\to  np$
b
The sequence of filling electrons in sixth period

$6s -4f- 5d -6p \,\,i.e., (ns) \to (n-2)f\to  (n- 1 )d \to  np$

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