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  2. Polyatomic ion - Wikipedia

    en.wikipedia.org/wiki/Polyatomic_ion

    In contrast, an ammonium ion consists of one nitrogen atom and four hydrogen atoms, with a charge of +1; its chemical formula is N H + 4. Polyatomic ions often are useful in the context of acid–base chemistry and in the formation of salts. Often, a polyatomic ion can be considered as the conjugate acid or base of a neutral molecule.

  3. Pentazenium - Wikipedia

    en.wikipedia.org/wiki/Pentazenium

    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.

  4. List of College GameDay (football TV program) locations

    en.wikipedia.org/wiki/List_of_College_GameDay...

    SEC Championship Game: January 1, 2004 4 Michigan Wolverines 14 1 USC Trojans: 28: Pasadena, California: Outside the Rose Bowl: Rose Bowl: USC Trojans January 4, 2004 3 LSU Tigers: 21: 2 Oklahoma Sooners 14 New Orleans, Louisiana: Superdome: Sugar Bowl – BCS National Championship Game: LSU Tigers

  5. IUPAC nomenclature of inorganic chemistry - Wikipedia

    en.wikipedia.org/wiki/IUPAC_nomenclature_of...

    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.

  6. Quaternary ammonium cation - Wikipedia

    en.wikipedia.org/wiki/Quaternary_ammonium_cation

    Quaternary ammonium cation. The R groups may be the same or different alkyl or aryl groups. Also, the R groups may be connected. In organic chemistry, quaternary ammonium cations, also known as quats, are positively-charged polyatomic ions of the structure [NR 4] +, where R is an alkyl group, an aryl group [1] or organyl group.

  7. Mercury polycations - Wikipedia

    en.wikipedia.org/wiki/Mercury_polycations

    The triangular Hg 4+ 3 cation was confirmed in a reinvestigation of the mineral terlinguaite in 1989 [4] and subsequently synthesised in a number of compounds. [11] The bonding has been described in terms of a three-center two-electron bond where overlap of the 6s orbitals on the mercury atoms gives (in D 3h symmetry) a bonding "a 1" orbital. [12]

  8. Coordination number - Wikipedia

    en.wikipedia.org/wiki/Coordination_number

    For molecules and polyatomic ions the coordination number of an atom is determined by simply counting the other atoms to which it is bonded (by either single or multiple bonds). [1] For example, [Cr(NH 3 ) 2 Cl 2 Br 2 ] − has Cr 3+ as its central cation, which has a coordination number of 6 and is described as hexacoordinate .

  9. Polyhalogen ions - Wikipedia

    en.wikipedia.org/wiki/Polyhalogen_ions

    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 ...