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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).
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.
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.
3 + F 2 + BF 3 → NF 4 BF 4. NF + 4 salts can also be prepared by fluorination of NF 3 with krypton difluoride (KrF 2) and fluorides of the form MF n, where M is Sb, Nb, Pt, Ti, or B. For example, reaction of NF 3 with KrF 2 and TiF 4 yields [NF + 4] 2 TiF 2− 6. [7] Many tetrafluoroammonium salts can be prepared with metathesis reactions.
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2 O 2− 7, trisulfate, S 3 O 2− 10 and pentasulfate S 5 O 2− 16 ions all contain 4-coordinate sulfur and are built from corner-shared {SO 4} tetrahedra. [14] Selenate compounds include many examples of four coordinate selenium, principally the tetrahedral SeO 2− 4 ion and the pyroselenate ion, Se 2 O 2− 7 which has a similar structure ...
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The hydrogen chromate ion, HCrO 4 −, is a weak acid: HCrO − 4 ⇌ CrO 2− 4 + H +; pK a ≈ 5.9. It is also in equilibrium with the dichromate ion: 2 HCrO − 4 ⇌ Cr 2 O 2− 7 + H 2 O. This equilibrium does not involve a change in hydrogen ion concentration, which would predict that the equilibrium is independent of pH.