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    any one want help in chemistry ask me?
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    In Sc, which fills first, the 3d or 4s sub-shell?
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    4s is first due to it's lower energy than 3d
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    4s
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    (Original post by Mohamed tahoon)
    4s is first due to it's lower energy than 3d
    In that case, why does IE1 involve the loss of the 4s electron first?

    Why would a lower energy electron be lost before a higher energy one?
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    word is not arranged ....could we chat in massenger?
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