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From Wikipedia

Monatomic ion

A monatomic ion is an ion consisting of one or more atoms of a single element (unlike a polyatomic ion, which consists of more than one element in one ion). A type Ibinary ionic compound contains a metal (cation) that forms only one type of ion. A type II ionic compound contains a metal that forms more than one type of ion, i.e., ions with different charges.

From Encyclopedia


anion , atom or group of atoms carrying a negative charge. The charge results because there are more electrons than protons in the anion. Anions can be formed from nonmetals by reduction (see oxidation and reduction ) or from neutral acids (see acids and bases ) or polar compounds by ionization. Anionic species include Cl - , SO 4-- , and CH 3 COO - . Highly colored intermediates in organic reactions are often radical anions (anions containing an unpaired electron). Salts are made up of anions and cations . See ion .


cation , atom or group of atoms carrying a positive charge. The charge results because there are more protons than electrons in the cation. Cations can be formed from a metal by oxidation (see oxidation and reduction ), from a neutral base (see acids and bases ) by protonation, or from a polar compound by ionization. Cationic species include Na + , Mg ++ , and NH 4+ . The cations of the transition elements have characteristic colors in water solution. Salts are made up of cations and anions . See ion .

From Yahoo Answers

Question:An unknown solution possibly containing alkali metal ions, alkaline earth metal ions, and halide ions gave a violet color when placed in a flame. The solution gave no precipitate when an ammonium carbonate solution was added. Addition of chlorine water, hexane and nitric acid produced two layers with a deep violet color in the upper layer. Identify the cations and anions present in the mixture.

Answers:cations= + NH4^+ anions= - CO3^2- Cl^- NO3^-

Question:Florine and Lithium are both in alkali earth metals, but for Lithium to turn ion it must lose an electron, and for Florine it needs to gain an electron. Why do some elements turn anion and some cation? And what charge does a lithium sodium ion have?

Answers:First of all, Flourine and Lithium are not both alkali earth metals. lithium's an alkali metal and flourine's a halogen; these names are derived from the columns in which they're found on the periodic table (the first column on the left for lithium and the second column from the right for flourine). Ionization has to do with the arrangement of electrons around the nucleus. There's things called electron shells, each can house a certain number of electrons. the outermost shell is called the valence shell. Atoms want to be stable, which basically means that their valence shell is full. It takes eight electrons in the outermost shell to stabilize. The reason that certain elements gain and certain elements lose depends on their position on the periodic table. Lithium and sodium are in the first column, and all of these have one electron in their valence shell. Rather than try and scrounge up seven electrons to fill that shell up, they drop the spare one and the next shell down is full, so they're stable. This is why they get positive charges; when they lose that electron there's more protons than electrons. The opposite is true of Flourine, Chlorine, etc in the seventh period (second column from the right). These have seven electrons in their valence shells, so it's easier for them to gain one to be stable. Incidentally, you'll notice that this is why atoms like Sodium and Chlorine pair up so well in ionic compounds; the sodium wants to get rid of an electron and the chlorine wants to gain an electron, so they're a perfect match! Finally, you'll never find lithium and sodium paired up in an ionic compound. each of the ions separately has a charge of 1+, however, because of the conditions mentioned above. Hope this helps a little bit!

Question:If Ion forms when an atom looses or gain electron and cation forms when an atom looses one or more electron, isn't both are the same. look!! 1)Ion=atom-1electron 2)Ion=atom+1electron 3)Cation=atom-1electron 4)cation=atom-more than 1electron Isn't 1=3 ?? I'm confused right now, I really need to understand this concept!!

Answers:if an atom LOSES an electron it means that a negative charge is being withdrawn from the ion..thus it becomes more positive..if the charge of the resulting ion is positive it is called a CATION. on the other hand, if an ion GAINS an electron..it means that the ion becomes more negative since it induces a negative charge (electron is negative) thus making the charge of the ion also negative..this is now called the ANION :D

Question:Or at least give me a good link? I specifically need to know how to figure out how to get the formula and the compound name out of a given cation and anions. Thanks! =] [For instance: Al+3 *cation*, and (So4)-2 *anion*]

Answers:A cation, is any ion that has a positive charge. While an anion, is any ion that has a negative charge. That's the basic idea. Good luck!

From Youtube

Cation Test - Alumnium (III) ion :Video demo of cation test of Alumnium (III) ion, Al3+, with both sodium hydroxide and aqueous ammonia

Chemistry: Naming Cations & Understanding Nomenclature :www.mindbites.com Naming chemical compounds can be tricky, and requires a little bit of knowledge about the trends and naming conventions. First, Professor Harman explains that how you name a compound will depend on the type of compound - whether it is an ion, molecular compound, acid, or base. For ions, the way you name the ion will depend on whether the compound is a cation or anion and whether or not it is monatomic, polyatomic, or a transition metal. Anions follow slightly more difficult naming conventions. Molecular compounds use Greek prefixes and will always start with the element furthest from Fluorine. Some molecular compounds have common names (such as water), and these are always used. Bases are simply named like ionic materials. Acids are named based on the suffix of the anion they are derived from. If the anion ends in -ate, the acid uses an -ic suffix. If the anion ends in -ite, the acid uses an -ous suffix. Taught by Professor Harman, this lesson was selected from a broader, comprehensive course, Chemistry. This course and others are available from Thinkwell, Inc. The full course can be found at www.thinkwell.com The full course covers atoms, molecules and ions, stoichiometry, reactions in aqueous solutions, gases, thermochemistry, Modern Atomic Theory, electron configurations, periodicity, chemical bonding, molecular geometry, bonding theory, oxidation-reduction reactions, condensed phases, solution properties, kinetics, acids and bases, organic reactions ...