The following table gives the electron affinities, in kJ/mol, for the group 1B and group 2B metals.
Why do the electron affinities of the group 1B elements become more negative as we move down the group? [Hint: Examine the trends in the electron affinity of other groups as we proceed down the periodic table.]
|Cu -119||Zn >0|
|Ag -126||Cd >0|
|Au -223||Hg >0|