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In chemistry, the pentazenium cation (also known as pentanitrogen) is a positively-charged polyatomic ion with the chemical formula N + 5 and structure N−N−N−N−N.Together with solid nitrogen polymers and the azide anion, it is one of only three poly-nitrogen species obtained in bulk quantities.
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 cation is always named first. Ions can be metals, non-metals or polyatomic ions. Therefore, the name of the metal or positive polyatomic ion is followed by the name of the non-metal or negative polyatomic ion. The positive ion retains its element name whereas for a single non-metal anion the ending is changed to -ide.
5 cluster. Bismuth clusters have been observed to act as ligands for copper [14] and ruthenium [15] ions. This behavior is possible due to the otherwise fairly inert lone pairs on each of the bismuth that arise primarily from the s-orbitals left out of Bi–Bi bonding. The 0.60 isosurface of the ELF of a Bi 2+ 8 cluster. Localizations around ...
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2, in which mercury has a formal oxidation state of +1. The Hg 2+ 2 ion was perhaps the first metal-metal bonded species confirmed. The presence of the Hg 2+ 2 ion in solution was shown by Ogg in 1898. [7] In 1900, Baker showed the presence of HgCl dimers in the vapour phase. [8] The presence of Hg 2+
5 v 4 o 4− 12 + 12 h + → 2 v 10 o 26 (oh) 4− 2 + 4 h 2 o When such acidifications are conducted in the presence of phosphate or silicate , heteropolymetalate result. For example, the phosphotungstate anion [PW 12 O 40 ] 3− consists of a framework of twelve octahedral tungsten oxyanions surrounding a central phosphate group.
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