Naming+Monatomic+and+Polyatomic+Ions

** Naming Monatomic and Polyatomic Ions ** = Naming Monatomic ion: = =A monatomic ion is a charged particle consisting of a single atom. (e.g Na +, F - , S²-)= =​= = a) Naming monatomic metal ions: = =Add the word "ion" after the name of the metal.= = Examples: = = "Na" Sodium metal → Sodium ion ( Na + )  + 1 electron = = the name of monatomic metal ion is Sodium ion = = "Ca" Calcium metal → Calcium ion ( Ca²+) + 2 electrons​= =the name of monatomic metal ion is Calcium ion = = If the metal ion has more than one possible charge... = = 1. Add the Roman numeral of the charge in bracket after the name of the metal. = = 2. Then add the word "ion" . = = — [ element name +(charge in Roman numeral) + "ion" ] = = Examples: = = "Ti3 + " Titanium metal →Titanium(III)ion + 3 electrons = = name of this monatomic metal ion is Titanium(III)ion = = "Co  2 +  " Cobalt metal →  Cobalt(II)ion + 2 electrons= =name of this monatomic metal ion is Cobalt(II)ion = = = = = =Exercise: write the formula of the ions.= =​​a.) Iron(II)ion → ​ Fe² +  b.) Chromium(III)ion → Cr³ +  = ​ = b) Naming monatomic non-metal ions: = = Change the original ending of the non-metal's name to "ide". (element stem name + "ide") = = Examples: = = "O" Oxygen → Ox ygen → Ox → Oxide (O  2- ) = ="S" Sulphur → Sulph ur → Sulph → Sulphide (S   2- ) = = = = = = Naming Polyatomic ions: = =A Polyatomic ion is a charged particle of two or more atoms. (e.g OH-, NH 4 + ​)= =We don't need to know how to name the Polyatomic ions, we should know those Polyatomic ions.= =Here are some common examples:= =​a. NH 4 + ammonium ion, (The only positive polyatomic ion we need to know) = = =

= b. “ ate ” ions: contain an atom bonded to several oxygen atoms: = =NO 3 - : Nitrate PO 4 ³- :Phosphate SO 4 ²- : Sulfate= =CO 3 ²- : Carbonate CH 3 CO²- : Acetate ClO³- : Chlorate= =c. “ ite ” ions: remove one oxygen from the “ate” ion and keep the same charge: = = NO 2 - : Nitrite PO 3 ³- : Phosphite SO 3 ²- : Sulfite= =ClO 2 - : Chlorite= =d. other common complex ions:= =OH- : Hydroxide CN- : Cyanide ​=

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