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The term molecule may or may not be used to refer to a polyatomic ion, depending on the definition used. The prefix poly-carries the meaning "many" in Greek, but even ions of two atoms are commonly described as polyatomic. [2] In older literature, a polyatomic ion may instead be referred to as a radical (or less commonly, as a radical group).
The oxides of d 0 metals such as V 2 O 5, MoO 3, WO 3 dissolve at high pH to give orthometalates, VO 3− 4, MoO 2− 4, WO 2− 4. For Nb 2 O 5 and Ta 2 O 5, the nature of the dissolved species at high pH is less clear, but these oxides also form polyoxometalates. As the pH is lowered, orthometalates protonate to give oxide–hydroxide ...
The phosphite ion, PO 3− 3, is a strong base, and so always carries at least one proton. In this case the proton is attached directly to the phosphorus atom with the structure HPO 2− 3. In forming this ion, the phosphite ion is behaving as a Lewis base and donating a pair of electrons to the Lewis acid, H +. Predominance diagram for chromate
Polyhalogen ions are a group of polyatomic cations and anions containing halogens only. The ions can be classified into two classes, isopolyhalogen ions which contain one type of halogen only, and heteropolyhalogen ions with more than one type of halogen.
The existence of the metal–metal bond in Hg(I) compounds was established using X-ray studies in 1927 [2] [page needed] and Raman spectroscopy in 1934 [3] making it one of the earliest, if not the first, metal–metal covalent bonds to be characterised. Other mercury polycations are the linear Hg 2+ 3 and Hg 2+ 4 ions, [3] and the triangular Hg 4+
2 Periodic table. Toggle Periodic table subsection ... 4.2 Ions. 4.3 Cations and anions. 4.4 Oxidation vs. reduction: ... 5.3 Polyatomic ions: −ate and -ite ions. 6 ...
Zintl phases are intermetallic compounds that have a pronounced ionic bonding character. They are made up of a polyanionic substructure and group 1 or 2 counter ions, and their structure can be understood by a formal electron transfer from the electropositive element to the more electronegative element in their composition.
The simplest tungstate ion is WO 2− 4, "orthotungstate". [1] Many other tungstates belong to a large group of polyatomic ions that are termed polyoxometalates, ("POMs"), and specifically termed isopolyoxometalates as they contain, along with oxygen and maybe hydrogen, only one other element. Almost all useful tungsten ores are tungstates. [2]