What is the electron configuration for an atom of manganese? (a) 1s 2 2s 2 2p 6

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What is the electron configuration for an atom of manganese?

(a) 1s2 2s2 2p6 3s2 3p6 3d5 

(b) 1s2 2s2 2p6 3s2 3p6 4s2 3d5 

(c) 1s2 2s2 2p6 3s2 3p6 4s2 4p5 

(d) 1s2 2s2 2p6 3s2 3p6 4s2 4d5 

(e) None of the above.

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