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Group 3 element
Additional recommended knowledge
IUPAC has not recommended a specific format for the periodic table, so different conventions are permitted and are often used for group 3. The following d-block transition metals are always considered members of group 3:
When defining the remainder of group 3, four different conventions may be encountered. (See group number of lanthanides and actinides):
Some tables  refer to all lanthanides and actinides by a marker in group 3. A third and fourth alternative are suggested by this arrangement:
Scandium, yttrium, and the lanthanides (except promethium) tend to occur together in the Earth's crust, and are relatively abundant compared with most d-block metals, but often harder to extract from their ores.
Group 3 elements are generally hard metals with low aqueous solubility, and have low availability to the biosphere. No group 3 has any documented biological role in living organisms. The radioactivity of the actinides generally makes them highly toxic to living cells.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Group_3_element". A list of authors is available in Wikipedia.|