ࡱ> qsp{ l bjbjzz :r=7::8,$P$|5jtt:Y(Y(Y(4444444$69|!5Y($jY(Y(Y(!5A 65},},},Y(z4},Y(4},},2l^4pƨ*_4*4L50|54*:+:T4:44Y(Y(},Y(Y(Y(Y(Y(!5!5m,Y(Y(Y(|5Y(Y(Y(Y(:Y(Y(Y(Y(Y(Y(Y(Y(Y(: Z: Chemistry 11 Inorganic Nomenclature The naming of elements and inorganic compounds The Chemical Elements Names and symbols First letter in the symbol is ALWAYS in upper case (capitals). Second letters, if present, are ALWAYS in lower case Many elements just use the first two letters of the elements name as the elements symbol (eg. Al, Bi, Li) When the first two letters have already been used with some other element, the first and third letters are often used Example: Ar = argon As = arsenic At = astatine Elements which were known in ancient times or which have names taken from substances known in ancient times have symbols derived from Latin ElementLatin NameSymbolAntimonystibiumCoppercuprumGoldauriumIronferrumLeadplumbiumMercuryhydragyriumPotassiumkaliumSilverargentumSodiumnatriumTinstannum A few elements have single letter symbols (eg. B, C, F, H, I, K, N, O, P, S) If in doubt of a elements symbol look it up in the Periodic Table !! Some of the following elements and their symbols frequently cause problems with students: Au and Ag: Au comes from Aurium, meaning shining or golden dawn Ag comes from Argent, meaning money or silver in French Manganese (Mn) and Magnesium (Mg): look at first and third letters W: Comes from Wolfram, the European name for tungsten Ra and Rn: Radium was found first, by Mme. Curie, so it gets to use the Ra combo first. Radon was found later. Naming Inorganic Compounds Going across the periodic table, the following correspondence is found between the columns of the table and the charges of the ions formed by the elements in the columns. (There are some exceptions, but assume the values below unless otherwise indicated.  IMPORTANT: Metals form POSITIVE ions Nonmetals form NEGATIVE ions (hydrogen is generally an exception) Definitions: An ANION is an ion with a NEGATIVE charge Eg. Cl-, NO3- A CATION is an ion with a POSITIVE charge Eg. Al3+, NH4+ Memory Aid: CATions are PUSSitive A MONATOMIC species is made up of only ONE atom Eg. Ne, Cl-, Li+ A DIATOMIC species is made up of two atoms (which may be the same or different types) Eg. O2, NO, ClO- A TRIATOMIC species is made up of three atoms Eg. CO2, O3, NOCl, H2O A POLYATOMIC species is made up of many atoms (generally can refer to any species with more than one atom) Eg. H3PO4, H2PO4-, SO42-, NH3, NO I. Naming Monatomic Ions Naming monatomic metal ions: Use the name of the metal and add the word ion Eg. sodium metal (Na) forms the sodium ion (Na+) Aluminum metal (Al) forms the aluminum ion (Al3+) The Stock System of naming metal ions: If a metal ion has more than one possible charge, the charge is indicated by a ROMAN NUMERAL, in brackets, immediately following the name Eg. Fe3+ = iron (III) ion, Fe2+ = iron (II) ion Pb4+ = lead (IV) ion, Pb2+ = lead (II) ion Naming monatomic non-metal ions: Drop the original ending of the elements name and add on an ide ending. (Hey kinda like in French and the tenses ) ElementElement symbolIon nameIon symbolfluorineFfluorideF-chlorineClchlorideCl-bromineBrbromideBr-iodineIiodideI-oxygenOoxideO2-sulphurSsulphideS2-nitrogenNnitrideN3-phosphorusPphosphideP3- II. Naming Polyatomic Ions The rules for naming polyatomic ions are somewhat complicated and are not part of the Chemistry 11 course. (Aww shucks!!) Instead, please refer to the chart titled Names, Formulae and Charges of Some Common Ions. Most of the polyatomic ions are anions (negative ions). The only exception is the ammonium ion (NH4+) which is a cation. You are not required to memorize the table of ions, but be familiar with the ions and their charges. III. Writing the chemical formula of an ionic compound Definition: An IONIC COMPOUND is a compound made up of ions *** Compounds are NEUTRAL MOLECULES, therefore there must equal numbers of + ion charges as there are - ion charges in the molecule The translation of a chemical name into a chemical formula is a simple process with 3 rules: 1. Write the formula for the cation first, then the anion second. Eg. Tin (IV) oxide is translated as 2. Criss-cross the numbers in front of the charges on the ions. (If no number is shown, use a 1). The result of the criss-crossing in this example is to take: Tidy up the formula if necessary: If both subscripts can be reduced (eg divided by 2), do so Omit the superscripted charges Omit any subscript which is a 1 Include brackets around any polyatomic ion IF the subscript next to it is greater than 1 IV. Writing the chemical name of an ionic compound Two possible situations: If the first ion in the compound only has one possible charge, simply write the names of the ions one after another. (omit the word ion from the name) If the first ion is a metal known to possess more than one possible charge OR a metal which is not on the chart, uncriss-cross the subscripts and use them as charges. Remember that the first ion has a positive charge and the second has a negative charge. Then write the metal name followed by the Roman Numeral that corresponds to its charge, then the nonmetal ion name. V. Naming Covalent Compounds Covalent compounds do not involve ions, but TWO DIFFERENT NONMETALS. The prefix-naming system is used. The rules for using this system are: Each compound name is made of two words, each with a suitable prefix. Prefix usedNumber of atomsmono1di2tri3tetra4penta5hexa6 The first name is just the name of the first element, with a prefix to indicate how many of these atoms exist in each molecule. The second name is the name of the second element, with an ide ending and a prefix to indicate how many of these atoms exist in each molecule. EXCEPTION: if there is only one of the first atom, do not use any prefix for that atom.     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