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cvbilicki_1672 - Naming Compounds Handout IONIC COMPOUNDS...

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CHEMISTRY Naming Compounds Handout page 1 of 12 IONIC COMPOUNDS versus MOLECULAR COMPOUNDS ionic compound: consist of cations (positive ions) and anions (negative ions) held together by electrostatic attraction –usually metal + nonmetal(s) – made of monatomic ions, polyatomic ions, and/or both monatomic ions: consist of a single atom polyatomic ions: consist of more than one atom molecular compound: consist of nonmetal atoms bonded together by shared electrons (covalent bonding) acid: a molecular compound that releases hydrogen ions (H + ) when dissolved in water NAMING MONATOMIC CATIONS: Metal atoms lose valence electrons to form positively charged ions, called cations . An ion formed from an individual atom is a monatomic (or monoatomic) cation . I. Groups IA to IIIA elements silver (Ag), zinc (Zn) and cadmium (Cd) form only one type of ion each: – Group IA elements form +1 ions: Li + , Na + , K + , Rb + , Cs + – Group IIA elements form +2 ions: Be +2 , Mg +2 , Ca +2 , Sr +2 , Ba +2 – Group IIIA elements form +3 ions: Al +3 – silver ion = Ag + ; zinc ion = Zn +2 ; cadmium ion = Cd +2 When a Group IA–IIIA element, silver, zinc, or cadmium forms an ion, it is named: element name + ion e.g. Na + = sodium ion Sr +2 = strontium ion Zn = zinc ion Naming Compounds Handout
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CHEMISTRY Naming Compounds Handout page 2 of 12 II. The Stock system is used to name transition metals and other metals that form more than one ion: – iron (Fe) forms two ions: Fe +2 and Fe +3 – lead (Pb) forms two ions: Pb +2 and Pb +4 When a a metal can form more than one ion, each ion is named: element name (charge in Roman numerals) + ion e.g. Fe +2 = iron (II) ion Pb +2 = lead (II) ion Cu + = copper (I) ion Fe +3 = iron (III) ion Pb +4 = lead (IV) ion Cu +2 = copper (II) ion Name each of the following monatomic cations: Li + = _________________________ Cd +2 = _________________________ Ag + = _________________________ Cu = _________________________ Al +3 = ________________________ Mg +2 = _________________________ Mn +2 = ________________________ Sn +4 = _________________________ H + = _________________________ Co = _________________________ Fe +3 = ________________________ Na + = _________________________ K + = ________________________ Ti +4 = _________________________ Ca = ________________________ Ni = _________________________
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CHEMISTRY Naming Compounds Handout page 3 of 12 NAMING MONATOMIC ANIONS: Nonmetal atoms gain valence electrons to form negatively charged ions called anions . When a nonmetal forms an ion, it is named: element stem name + “ide” + ion e.g. O = ox ygen atom O –2 = ox ide ion N = nitr ogen atom N –3 = nitr ide ion P = phosph orus atom P phosh Name each of the following monatomic anions: F = _________________________ Se –2 = _________________________ Br = _________________________ S –2 = I = P –3 = Cl = _________________________ O –2 = NAMING POLYATOMIC IONS: Ions made up of more than one atom are polyatomic ions : only one polyatomic cation: NH 4 + = ammonium ion –m a n y polyatomic anions: see table below NH 4 + = ammonium ion Polyatomic Ions OH = hydroxide ion NO 2
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cvbilicki_1672 - Naming Compounds Handout IONIC COMPOUNDS...

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