CHAPTER 3(nomenclature) - CHAPTER 3 NOMENCLATURE OUTLINE Chemical formulas Formulas for ionic compounds Binary nonmetal-nonmetal compounds Naming ionic


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OUTLINE Chemical formulas Formulas for ionic compounds Binary nonmetal-nonmetal compounds Naming ionic compounds Naming acids and acid salts
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CHEMICAL FORMULAS 1. Ionic bonding involves transfer of electrons. 2. Covalent bonding involves electron sharing. 3. Formula is a combination of symbols that identifies a compound, an ion or a molecule of an element. 4. Formula also indicates the relative quantities of the elements contained in the compound or ion and implies some kind of chemical bonding between the atoms.
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Molecules of Elements 1. Formulas are used to identify molecules of free elements. 2. A molecule contains two or more nonmetallic atoms bonded together. 3. Many free (uncombined) nonmetallic elements exist as molecules such as H2, N2, O2, F2, Cl2, Br2 and I2 as well as P4 and S8. 4. Some other free (uncombined) elements also occur in different forms. Different forms of the same element are called allotropes of each other. 5. Example: Carbon has three allotropes that are graphite, diamond and fullerene. Phosphorus and
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10. Figure of some elements that occur as molecules
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11. The seven elements that form diatomic molecules
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12. Allotropes
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Binary Compounds 1. Atoms of two or more different nonmetals bond together to form molecules of a compound. 2. Binary compound is a compound containing only two elements. 3. In a binary compound, element that attracts electrons less is usually written first. 4. Elements are assigned an electronegativity that reflects their affinity for electrons in a chemical bonds. 5. The elements that attract electrons most are said to be the most electronegative .
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  • Spring '12
  • Atom, atoms, Ion, Chemical bond

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