Cations with multiple charges may be given special names. For example, a cation with a +2 charge is a dication. One with a +3 charge is a trication. Azwitterionhas both positive and negative charges at different regions of the molecule, yet an overall neutral charge. The symbol for a...
The word "anion" is a Greek word meaning "going up," while cation is a Greek word meaning "going down." In this lesson, learn about cations and anions in more detail, how they form, and examples. By the end of this lesson, answer the following questions: What is a cation? What ...
In chemistry,cationsare indicated with a plus sign (+) andanionsare indicated with a minus sign (-), with the number of symbols indicating the number of electrons lost or gained (this is called an atom’svalence). For example, the symbolsNa+andCa++indicatecations, whileCl-indicates ananion...
One example is hydrogen, which may gain (H-) or lose (H+) an electron, forming hydride compounds such as ZnH2 (where it is an anion) and hydron compounds such as H2O (where it is a cation). Elements in group 18 of the periodic table – the “noble gases”, tend not...
It was established that the binding of molecules and/or charged particles by various fragments of calix[4]arene and calix[4]pyrrole porphyrins are interrelated processes. This makes it possible to use one process (for example, complexation of the calix[4]arene fragment of the macrocycle with ...
Often crystal structures have an unequal number of cations and anions. Ionic compounds with a cation to anion ratio of 1:2 adopt the fluorite or the CaF2 structure. Sodium fluoride (NaF) is the simplest example with a structure similar to sodium chloride. CaF2 and MgF2 are other common ...
Dietary cation–anion difference (DCAD)Calculated as a ratio of positively charges and negatively charged, divalent and monovalent mineral ions in a feed. From: Encyclopedia of Agriculture and Food Systems, 2014 About this page Set alert
Related to cation exchanger: Cation exchange resin, Anion exchangercat·i·on ex·chang·er (kat'ī-on eks-chānj'ĕr), An insoluble solid (usually a polystyrene or a polysaccharide) that has negatively charged radicals attached to it (for example, -COO-, -SO3-), which can attract a...
(chemistry,physics) anionwith a positive electricalchargecompareanionTopicsPhysics and chemistryc2 Word Origin Join us Join our community to access the latest language learning and assessment tips from Oxford University Press! Seecationin the Oxford Advanced American DictionarySeecationin the Oxford Le...
combined with the anion-exchange reaction, NaCl is removed from the solution (desalting). Cation exchange may also be used chromatographically, to separate cations, and medicinally, to remove a cation, for example, H+, from gastric contents, or Na+and K+in the intestine. See:anion exchange....