16. Why is the third ionization energy of magnesium much greater than that of al

Question

16.    Why is the third ionization energy of magnesium much greater than that of

         aluminum? (8 pt)

17.    For each of the following sets of atoms and ions, arrange the member in order of

         increasing size. Explanations for the orders are not necessary. (12 pt)

         a.      Se2-                 Se                    Te2-

         b.      Fe2+                 Co3+                 Fe3+

         c.      Ca                   Sc3+                 Ti4+

         d.      Na1+                 Be2+                 Ne

Explanation / Answer

16)

Mg has 2 electrons in its valence shell. So, after losing 2 electrons, it attains complete octet and hence removing 3rd electron is very hard

Al has 3 electrons in its valence shell. So, after losing 2 electrons, it still has 1 electron in its valence shell by losing which it can attain complete octet. So, it readily loses the 3rd electrons easily to attain complete octet configuration

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