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    Why is the biggest jump between the sixth and seventh ionisation energy? (Graph seen F321 Jan 2013 Question 3bii) )
    My exam is on Friday so any replies before then would be appreciated!!
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    (Original post by annaj97)
    Why is the biggest jump between the sixth and seventh ionisation energy? (Graph seen F321 Jan 2013 Question 3bii) )
    My exam is on Friday so any replies before then would be appreciated!!
    Oxygen: 1s2, 2s2, 2p6

    The sixth electron is being removed from the second quantum energy level/ shell whereas the seventh is being removed from the first. The first shell is much closer to the nucleus, and the electrons in this shell experience no effect of shielding. This means there is a greater force of attraction between the nucleus and the seventh electron, which requires more energy to overcome.
 
 
 

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