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    With regards to electron filling, we know that 4s fills before 3d. However, is this also the case for electron removal? Say we wanted to remove 2 electrons from Gallium. Would the second electron be removed from the 4s or the 3d shell?
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    (Original post by HarrisonGCSE)
    With regards to electron filling, we know that 4s fills before 3d. However, is this also the case for electron removal? Say we wanted to remove 2 electrons from Gallium. Would the second electron be removed from the 4s or the 3d shell?
    You would remove the electron/s from the 4s first
 
 
 
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