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before we put electron(s) in 3d electron shell,electron shells arrange like this( 4s,3d)but as we put electron(s) in 3d they arrange like this (3d,4s). why this is happend?
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can you help me @aaronq , @Abhisar , @ganeshie8 ?
because their energy is lower
plz explain further.@aaronq
what do you think @Luigi0210 , @chmvijay ?
i am sorry first 3d is 4s
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1. Orbital which has the least value of (n+l) will be filled first to the electrons can u calculate n+l values for 3d and 4s
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