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Writing Formulae and Naming

Writing Formulae and Naming. Chapter 19 Section 3a. Binary Ionic Compounds. Charge can also be represented by oxidation number Oxidation number represents the movement of electrons no matter what kind of bonding Oxidation number of ion is the same as its charge

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Writing Formulae and Naming

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  1. Writing Formulae and Naming Chapter 19 Section 3a

  2. Binary Ionic Compounds • Charge can also be represented by oxidation number • Oxidation number represents the movement of electrons no matter what kind of bonding • Oxidation number of ion is the same as its charge • Formula must be written so that sum of charges for all ions is zero

  3. Rules for Writing Formulae • Write the symbol for the positive ion or polyatomic ion first • Write the symbol for the negative ion or polyatomic ion next • Use subscripts to multiply the ions so that sum of charges is zero

  4. Special Ions • Transition elements can have more than one charge • They will always be positive • To indicate charge, Roman numeral is used • Examples: • Copper (I) Cu+1 • Copper (II) Cu+2 • Iron (III) Fe+3

  5. Examples • Write the formula for sodium chloride • Write the formula for magnesium fluoride • Write the formula for lead (IV) phosphide • Write the formula for copper (I) oxide • Write the formula for copper (II) oxide

  6. Some Special Ions • Polyatomic ions: • A group of atoms bonded covalently that have gained or lost electrons and become ions • Examples: • Ammonium NH4+ • Acetate C2H3O2- • Hydroxide OH- • Carbonate CO3-2 • Sulfate SO4-2 • Phosphate PO4-3

  7. Naming Compounds • Rules: • Write the name of the positive ion • If the positive ion is a transition element, use a Roman numeral to indicate its charge • Write the root name of the negative ion • Add the suffix –ide to the negative name

  8. Naming Example • Name the compounds: • KI • MgOH • Al2O3 • PCl3

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