Doubt from atomic structure and periodic table

Question no 1 i am not able to understand how can we find atomic number through quantum numbers

Is the answer D i.e Ni

Yes but how did you predict atomic number

Carefully observe the question as it simply says last electron's quantum numbers.

1s2 2s2 2p6 3s2 3p6 4s2 3d8 . Atomic number 28

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Oh i didn't noticed it thank you