Why does sodium have the highest second ionisation energy?
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The reason the second ionization energy is higher than the first relates to the attraction between the electrons and the nucleus. When one attempts to remove a second electron from a positive ion, there is more attraction between the electrons and the nucleus due to the extra proton.
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Explanation:
In case of sodium with atomic number of 11, it has electronic configuration of 2,8, 1. On losing one electron it acquires stable noble gas configuration of 2,8 and thus it gets difficult for the loss of second electron and The second ionisation energy of sodium is very high.
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