Identify the pair of elements in which number of electrons in (n-1) shell is same

Step-by-step solution

1. Fe electronic configuration = [ Fe 1 ~s ^2 2 ~s ^2 2 p ^6 3 ~s ^2 . .3 p ^6 4 ~s ^2 3 ~d ^6 ] Here (n-1) shell is 3 d which have 6 electron. 2. mn electronic configuration [ Mn 1 ~s ^2 2 ~s ^2 2 p ^6 3 ~s ^2 . .3 p ^6 4 ~s ^2 3 ~d ^5 ] ( n -1 ) shell have 5 electrons 3. Zn electronic configuration [ Zn 1 ~s ^2 2 ~s ^2 2 p ^6 3 ~s ^2 .3 p ^6 4 ~s ^2 3 ~d ¹⁰ ] [ n -1 ) shell have 10 electron] 4. Sc electronic configuration [ Sc 1 ~s ^2 2 ~s ^2 2 p ^6 3 ~s ^2 3 p ^6 .4 ~s ^2 3 ~d ^1 ] (n-1) shell have 1 electron. K