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QUESTION

# the spectroscopic notation (also called spdf notation) electron configuration of Ni?

Ni is number 28 on (Atomic number is  28)

spdf Ni :  1s^2 2s^2 2p^6 3s^2 3p^6 3d^8 4s^2

To check the total of all powers: 2+2+6+2+6+8+2 = 28

The power of the subshell(s, p, d, f) gives the number of electrons on each subshell.

maximum values for subshells: s =2 p =6 d = 10 f =14

Note : The reason why i didn't fill the 3d with 10, but rather put 2 in 4s and 8 in the 3d is that,

4s  subshell is lower than the 3d subshell and so it must be filled first.

So you fill it with 2 (maximum for an s subshell) before putting the rest in 3d

Important fact :

The 4s subshell is always filled before the the 3d .