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  4. The table gives the first four ionization energies in kJ mol- 1 of four elements (the letters are not the symbols for the elements). Which element occurs in Group 13 of the periodic table?

Q. The table gives the first four ionization energies in of four elements (the letters are not the symbols for the elements). Which element occurs in Group 13 of the periodic table?

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Solution:

After losing three electrons in element R, there is sudden huge increase in IE from 2751 to 11584 kJ/mol. It means that after three electrons, some stable configuration is achieved. This is applicable to group 13 elements with outer configuration of .

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