Which of the following electron configurations is correct for nickel?

Which of the following electron configurations is correct for nickel?

Q. Which of the following electron configurations is correct for nickel?

A.            [Ar] 4s1 3d8

B.            [Kr] 4s1 4d8

C.            [Kr] 4s1 3d8

D.            [Ar] 4s2 3d8

Answer: [Ar] 4s2 3d8

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