![]() When writing the ionic formula, we follow two additional conventions: (1) write the formula for the cation first and the formula for the anion second, but (2) do not write the charges on the ions. Each ion has a single charge, one positive and one negative, so we need only one ion of each to balance the overall charge. /videos/searchqiron+3+sulfide+charge&qpvtiron+3+sulfide+charge&FORMVDRE When naming ionic compounds whose cations can have more than one possible charge, we must also. It is conventional to use the lowest ratio of ions that are needed to balance the charges.įor example, consider the ionic compound between Na + and Cl −. Because the charges on the ions are characteristic, sometimes we have to have more than one of a cation or an anion to balance the overall positive and negative charges. The key to writing proper ionic formulas is simple: the total positive charge must balance the total negative charge. A proper ionic formula has a cation and an anion in it an ionic compound is never formed between two cations only or two anions only. Thus, Cl − is the chloride ion, and N 3− is the nitride ion.Ĭhemical formulas for ionic compounds are called ionic formulas. This is similar to how we named molecular compounds. ![]() In print, we use roman numerals in parentheses to represent the charge on the ion so these two iron ions would be represented as the iron(II) cation and the iron(III) cation, respectively.įor a monatomic anion, use the stem of the element name and append the suffix -ide to it, and then add ion. Thus, Fe 2 + is the iron two ion, while Fe 3 + is the iron three ion. If the element has more than one possible charge, the value of the charge comes after the element name and before the word ion. So Na + is the sodium ion Ca 2 + is the calcium ion. For a cation, simply use the name of the element and add the word ion (or if you want to be more specific, add cation) after the element's name. An element symbol without a charge written next to it is assumed to be the uncharged atom. If the charge is a single positive or negative one, the number 1 is not written if the magnitude of the charge is greater than 1, then the number is written before the + or − sign. The magnitude of the charge is listed as a right superscript next to the symbol of the element. Note the convention for indicating an ion. Unfortunately, there is little understanding which two charges a metal atom may take, so it is best to just memorize the possible charges a particular element can have. Cobalt is another element that can form more than one possible charged ion (2+ and 3+), while lead can form 2+ or 4+ cations. ![]() For example, iron atoms can form 2+ cations or 3+ cations. A few elements, all of which are metals, can form more than one possible charge. Third, there are some exceptions to the previous point. \): Monatomic Ions of Various Charges Ions formed by losing a single electron iron copper - nickel mattes in con- verters in which the iron sulfide is.
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