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Writing Formulas of Ionic Compounds

Writing Formulas of Ionic Compounds. By Sharon Mace, West Stanly HS, NC. Binary Ionic Compounds:. Binary Ionic Compounds:. Have only two types of elements. Are made of monatomic ions only. The name always ends in “-ide ”. The first ion is always positive.

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Writing Formulas of Ionic Compounds

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  1. Writing Formulas of Ionic Compounds By Sharon Mace, West Stanly HS, NC

  2. Binary Ionic Compounds:

  3. Binary Ionic Compounds: • Have only two types of elements. • Are made of monatomic ions only. • The name always ends in “-ide”. • The first ion is always positive. • The second ion is always negative. • They DO NOT have an overall charge. • They NEVER have ( )’s. (Parentheses are only used with more than oneof a polyatomic ion, never with a monatomic ion.)

  4. Example:Sodium Chloride

  5. Example:Sodium Chloride Na+1 Cl-1

  6. Example:Sodium Chloride Na+1 Cl-1 It takes one of each ion to make a neutral compound.

  7. Example:Sodium Chloride Na+1 Cl-1 It takes one of each ion to make a neutral compound. NaCl • NaCl

  8. OR… Use the criss-cross method:

  9. Example:Sodium Chloride Na+1 Cl-1

  10. Example:Sodium Chloride Na+1 Cl-1 Take the 1 from the Na and put it as the invisible subscript on Cl.

  11. Example:Sodium Chloride Na+1 Cl-1 Take the 1 from the Na and put it as the invisible subscript on Cl. Take the 1 from Cl and put it as the invisible subscript on Na.

  12. Example:Sodium Chloride Na+1 Cl-1 Take the 1 from the Na and put it as the invisible subscript on Cl. Take the 1 from Cl and put it as the invisible subscript on Na. NaCl • NaCl

  13. Example:Magnesium Chloride

  14. Example:Magnesium Chloride Mg+2 Cl-1

  15. Example:Magnesium Chloride Mg+2 Cl-1 It takes one magnesium and two chlorides to make a neutral compound.

  16. Example:Magnesium Chloride Mg+2 Cl-1 It takes one magnesium and two chlorides to make a neutral compound. Mg+2 + Cl-1 + Cl-1 = No charge

  17. Example:Magnesium Chloride Mg+2 Cl-1 It takes one magnesium and two chlorides to make a neutral compound. Mg+2 + Cl-1 + Cl-1 = No charge MgCl2 • MgCl2

  18. OR… Use the criss-cross method:

  19. Example:Magnesium Chloride Mg+2 Cl-1

  20. Example:Magnesium Chloride Mg+2 Cl-1 Take the 2 from the Mg and put it as the subscript on Cl.

  21. Example:Magnesium Chloride Mg+2 Cl-1 Take the 2 from the Mg and put it as the subscript on Cl. MgCl2

  22. Example:Magnesium Chloride Mg+2 Cl-1 Take the 2 from the Mg and put it as the subscript on Cl. MgCl2 Take the 1 from Cl and put it as the invisible subscript on Mg.

  23. Example:Magnesium Chloride Mg+2 Cl-1 Take the 2 from the Mg and put it as the subscript on Cl. MgCl2 Take the 1 from Cl and put it as the invisible subscript on Mg. MgCl2 • MgCl2

  24. Example:Aluminum Sulfide

  25. Example:Aluminum Sulfide Al+3 S-2

  26. Example:Aluminum Sulfide Al+3 S-2 It takes two aluminum ions and three sulfide ions to make a neutral compound.

  27. Example:Aluminum Sulfide Al+3 S-2 It takes two aluminum ions and three sulfide ions to make a neutral compound. Al+3 + Al+3 + S-2 + S-2 + S-2 = No Charge

  28. Example:Aluminum Sulfide Al+3 S-2 It takes two aluminum ions and three sulfide ions to make a neutral compound. Al+3 + Al+3 + S-2 + S-2 + S-2 = No Charge Al2S3 • Al2S3

  29. OR… Use the criss-cross method:

  30. Example:Aluminum Sulfide Al+3 S-2

  31. Example:Aluminum Sulfide Al+3 S-2 Take the 3 from the Al and put it as the subscript on S.

  32. Example:Aluminum Sulfide Al+3 S-2 Take the 3 from the Al and put it as the subscript on S. AlS3

  33. Example:Aluminum Sulfide Al+3 S-2 Take the 3 from the Al and put it as the subscript on S. AlS3 Take the 2 from S and put it as the subscript on Al.

  34. Example:Aluminum Sulfide Al+3 S-2 Take the 3 from the Al and put it as the subscript on S. AlS3 Take the 2 from S and put it as the subscript on Al. Al2S3 • Al2S3

  35. Example:Magnesium Oxide

  36. Example:Magnesium Oxide Mg+2 O-2

  37. Example:Magnesium Oxide Mg+2 O-2 It only takes ONE of each ion to make a neutral compound.

  38. Example:Magnesium Oxide Mg+2 O-2 It only takes ONE of each ion to make a neutral compound. Mg+2 + O-2 = No charge

  39. Example:Magnesium Oxide Mg+2 O-2 It only takes ONE of each ion to make a neutral compound. Mg+2 + O-2 = No charge MgCl2 • MgO

  40. OR… Use the criss-cross method:

  41. Example:Magnesium Oxide Mg+2 O-2 First, you must reduce the charge ratio! A +2 to -2 ratio cancels to +1 to -1:

  42. Example:Magnesium Oxide Mg+2 O-2 First, you must reduce the charge ratio! A +2 to -2 ratio cancels to +1 to -1: Mg+1 O-1 NOW you can criss-cross:

  43. Example:Magnesium Oxide Mg+2 O-2 First, you must reduce the charge ratio! A +2 to -2 ratio cancels to +1 to -1: Mg+1 O-1 NOW you can criss-cross: • MgO

  44. Now you try it: Question answer • Potassium selenide • Aluminum phosphide • Beryllium carbide ________ ________ ________ Watch out for canceling!

  45. Now you try it: Question answer • Potassium selenide • Aluminum phosphide • Beryllium carbide K2S AlP Be2C

  46. Adding Transition Metal Ions: When the name of a compound contains a transition metal ion, the Roman numeral or the classical name refers to the charge on the ion BEFORE you figure out the formula of the compound.

  47. Example:Manganese (II) BromideORManganous Bromide:

  48. Example:Manganese (II) BromideORManganous Bromide: Mn+2 Br-1

  49. Example:Manganese (II) BromideORManganous Bromide: Mn+2 Br-1 • MnBr2

  50. Example:Ferric NitrideORIron (III) Nitride:

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