Note: Greek prefixes are not used to indicate the number of atoms of each element in the formula unit for the compound (e.g., FeI 3 is named "iron(III) iodide" not "iron(III) triiodide"). The three waters added back in balance the change from ammonia to ammonium as well as the three hydroxides on the chromium(III) hydroxide. The anion is named by adding the suffix -ide to the root of the (nonmetal) element name (e.g., iodine = I, " iodide" = I - sulfur = S, " sulfide" = S 2-). The charge on the cation is indicated using a Roman numeral, within parentheses, immediately following the name of the cation (e.g., Fe 3+ = "iron(III)", Fe 2+ = "iron(II)"). Name of Cation, Name of Anion, Formula of Cation, Formula of Anion, Formula of Compound. The name of the cation is the same as the name of the (neutral metal) element from which it is derived. The positive ion (cation) is written first in the name the negative ion (anion) is written second in the name. For example, iron(III) iodide, FeI 3, is composed of iron ions, Fe 3+ (elemental iron is a metal), and iodide ions, I - (elemental iodine is a nonmetal). In this video we'll write the correct formula for Chromium (III) sulfide (Cr2S3).To write the formula for Chromium (III) sulfide we’ll use the Periodic Table. A binary ionic compound is composed of ions of two different elements - one of which is a metal, and the other a nonmetal. In this video we'll write the correct formula for Chromium (II) sulfide (CrS).To write the formula for Chromium (II) sulfide we’ll use the Periodic Table and.
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