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Give the electron coeficient of the fol...

Give the electron coeficient of the following elements `._(19)K,_(25)Mn,_(20)Ca`

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The correct Answer is:
A
`._(19)K = 1s^(2)2s^(2)2p^(6)3p^(6)4s^(1)`
`._(23)Mn = 1s^(2)2s^(2)2p^(6)3p^(6)3d^(5)4s^(2)`
`._(20)Ca = 1s^(2)2s^(2)2p^(6)3p^(6)4s^(2)`
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