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Ionic Compound

Ionic Compound. A compound made up of one or more positive metal ions ( cations ) and one or more negative non-metal ions (anions) Most ionic compounds have: High melting points are hard and brittle Form electrolytes (conduct electricity) when dissolved in water to form solutions.

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Ionic Compound

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  1. Ionic Compound • A compound made up of one or more positive metal ions (cations) and one or more negative non-metal ions (anions) • Most ionic compounds have: • High melting points • are hard and brittle • Form electrolytes (conduct electricity) when dissolved in water to form solutions

  2. Formation of Sodium Chloride

  3. Chemical Formula of an Ionic Compound • Step 1: Write the symbols of the elements, with the metal on the left-hand side and the non-metal on the right-hand side. Mg Cl • Step 2: Add the ionic charge of each ion above the symbol +2 -1 Mg Cl

  4. Step 3: Determine the number of ions required to bring the charge to zero. 1(+2) + 2(-1) = 0 Mg O • Step 4: Write the chemical formula using the (red) coefficients in front of each bracket as subscripts Mg1Cl2Note: Do not write the subscript “1” The chemical formula for magnesium chloride is MgCl2

  5. Crisscross Method • Step 1: Write the symbols of the elements and their ionic charges Mg 2+ Cl- • Step 2: Crisscross the numbers of the ionic charges so that they now become subscripts Mg 2+ Cl- MgCl2

  6. Considering Multiple Ionic Charges • Write the chemical name of CuBr2. Note that copper could have either of two ionic charges (+1 or +2). • Each bromide ion has a charge of -1, so the total charge of bromide ions is 2(-1). • The ionic charge of copper in this compound is +2 • Roman numerals are included ONLY if the metal has more than one ionic charge. • The name of CuBr2 is copper (II) bromide

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