1.- Which of the following elements has the largest secondionization energy(IE2)

Question

1.- Which of the following elements has the largest secondionization energy(IE2)? a) Na     b) Al     c)S     d) Cl      e)K 2.- Which of the following elements has the greatest (mostnegative) electron affinity? a) K     b) Br     c)As     d) Ar     e) I 1.- Which of the following elements has the largest secondionization energy(IE2)? a) Na     b) Al     c)S     d) Cl      e)K 2.- Which of the following elements has the greatest (mostnegative) electron affinity? a) K     b) Br     c)As     d) Ar     e) I

Explanation / Answer

1) Na+ and K+ have noble gas configurations. So once you ionize them,you are destroying the stable octet. Cl+, S+, Al+ don't haveoctets. Na+ has a higher second ionization energy than K+, because it ishigher in the group (K is larger so its electron cloud is morediffused, so electrons are less tightly binded to the nucleus)Answer is a) Second Ionization energies: Na 4.56 eV        

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