Fill in the blanks Lanthanide Contraction: The electron configuration of e...
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Lanthanide Contraction: The electron configuration of every third-row d-block metal, there are 4f electrons. These extra electrons along with the extra protons cause
d-block metals to be more similar in size to the second-row d-block metals. The expected large increase in size in going from the
to
row is not observed due to the
in the effective nuclear charge experienced by the valence electrons, brought about because of
shielding by
electrons.
E.g. Given the atomic radii of the copper and silver to be 157 pm and 175 pm respectively, the atomic radius of gold can be estimated to be pm which is
than expected.
Electron configurations: Cu - [Ar] 3d10 4s1 ; Ag - [Kr]4d105s1 ; Au - [Xe]4f145d106s1
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