An effect that causes sixth period elements with filled 4f subshells to be smaller than otherwise expected. The intervention of the lanthanides increases the effective nuclear charge, which offsets the size increase expected from filling the n=6 valence shell. As a consequence, sixth period transition metals are about the same size as their fifth ...
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http://antoine.frostburg.edu/chem/senese/101/glossary/l.shtml
Lanthanide contraction is a term used in chemistry to describe the greater than expected decrease in ionic radii of the elements in the lanthanide series from atomic number 57, lanthanum, to 71, lutetium, which results in smaller than otherwise expected ionic radii for the subsequent elements starting with 72, hafnium. The term was coined by the N...
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http://en.wikipedia.org/wiki/Lanthanide_contraction
in chemistry, the steady decrease in the size of the atoms and ions of the rare-earth elements with increasing atomic number from lanthanum (atomic ... [3 related articles]
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http://www.britannica.com/eb/a-z/l/15
A decrease in the radii of the elements following the lanthanides compared to what would be expected if there were no f-transition metals.
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http://www.chemistry-dictionary.com/definition/lanthanide+contraction.php
A decrease in the radii of the elements following the lanthanides compared to what would be expected if there were no f-transition metals.
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http://www.encyclo.co.uk/local/20728
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