In chemistry, the term transition metal (sometimes also called a transition element) has two possible meanings:

• It commonly refers to any element in the d-block of the periodic table, including zinc, cadmium and mercury. This corresponds to groups 3 to 12 on the periodic table.

• More strictly, IUPAC defines a transition metal as "an element whose atom has an incomplete d sub-shell, or which can give rise to cations with an incomplete d sub-shell." By this definition, zinc, cadmium, and mercury are excluded from the transition metals, as they have a d¹⁰ configuration. Only a few transient species of these elements that leave ions with a partly filled d subshell have been formed, and mercury(I) only occurs as Hg₂^{2+, which does not strictly form a lone ion with a partly filled subshell, and hence these three elements are inconsistent with the latter definition.Cotton, F. Albert; Wilkinson, G.; Murillo, C. A. (1999). Advanced Inorganic Chemistry (6th ed.). New York: Wiley. They do form ions with a 2+ oxidation state, but these retain the 4d10 configuration. Element 112 may also be excluded although its oxidation properties are unlikely to be observed due to its radioactive nature. This definition corresponds to groups 3 to 11 on the periodic table.}

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It's okay if no one knows this, I did the rest and completed it, but what is: the first rows of transition metals at the bottom of the PTOE
Tab_Sel (Tabby Sellers) Thu, 17 Dec 2009 03:05:43 -0000
It's okay if no one knows this, I did the rest and completed it, but what is: the first rows of transition metals at the bottom of the PTOE
The charge of a monotamic ion is its oxidation number Most transition metals and groups 3a & 4a have more then one
KingRexTX (Rex Royal) Wed, 16 Dec 2009 13:53:30 -0000
The charge of a monotamic ion is its oxidation number Most transition metals and groups 3a & 4a have more then one

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