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Electronic formula of Potassium cation:

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Electronic formula of Potassium cation: 

А.   3s2 3p6 4s1

B.   5s1

C.   1s2 2s2 2p6 3s2 3p6 4s1

D.  1s2 2s2 2p6 3s2 3p6 

E.  3s2 3p6

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D.   1s2 2s2 2p6 3s2 3p6

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