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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. Polyoxometalate - Wikipedia

    en.wikipedia.org/wiki/Polyoxometalate

    The phosphotungstate anion, an example of a polyoxometalate. In chemistry, a polyoxometalate (abbreviated POM) is a polyatomic ion, usually an anion, that consists of three or more transition metal oxyanions linked together by shared oxygen atoms to form closed 3-dimensional frameworks.

  4. Isomer - Wikipedia

    en.wikipedia.org/wiki/Isomer

    The English word "isomer" (/ ˈ aɪ s əm ər /) is a back-formation from "isomeric", [2] which was borrowed through German isomerisch [3] from Swedish isomerisk; which in turn was coined from Greek ἰσόμερoς isómeros, with roots isos = "equal", méros = "part". [4] Two broad types of isomers

  5. 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.

  6. Chemical formula - Wikipedia

    en.wikipedia.org/wiki/Chemical_formula

    For ions, the charge on a particular atom may be denoted with a right-hand superscript. For example, Na +, or Cu 2+. The total charge on a charged molecule or a polyatomic ion may also be shown in this way, such as for hydronium, H 3 O +, or sulfate, SO 2− 4. Here + and − are used in place of +1 and −1, respectively.

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    AOL Desktop Gold is included at no additional cost with your membership. 1. Sign in to your MyBenefits page. 2. Under 'All Products' scroll to 'AOL Desktop Gold'. 3. Click Download Now. 4. Follow the installation steps listed below.

  9. List of chemistry mnemonics - Wikipedia

    en.wikipedia.org/wiki/List_of_chemistry_mnemonics

    Cations are positively (+) charged ions while anions are negatively (−) charged. This can be remembered with the help of the following mnemonics. Cats have paws ⇔ Cations are pawsitive. [23] Ca+ion: The letter t in cation looks like a + (plus) sign. [24] An anion is a negative ion. (An egative ion ⇒ Anion). [25]