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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. For example, the conjugate base of sulfuric acid (H 2 SO 4) is the polyatomic hydrogen sulfate anion (HSO − 4).
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.
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.
List of Indian superhero films; List of superhero productions created by Toei; List of films based on comics; List of films based on comic strips; List of films based on English-language comics; List of films based on French-language comics; List of films based on manga; List of films based on radio series; List of films based on video games ...
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This is chronological list of action films split by decade. Often there may be considerable overlap particularly between action and other genres (including, horror , comedy , and science fiction films ); the lists should attempt to document films which are more closely related to action, even if they bend genres.
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The following is a list of highest grossing action films of time,The top 3 are along the highest-grossing films, being 11th, 12th and 33rd. James Bond is the most frequent franchise with 11 films on the list. All of the films have had a theatrical run (including re-releases) since 1991, and films that have not played during this period do not ...