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Ionic Formula Writing

Ionic Formula Writing. H 2 O. H 2 means 2 Hydrogen atoms O means 1 Oxygen atom Why?. NaCl. Na - 1 Sodium Cl - 1 Chlorine Why?. Columns = Groups Rows = Periods. 1+. 2+. 3+. 4±. 3-. 2-. 1-. So what about NaCl?.

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Ionic Formula Writing

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  1. Ionic Formula Writing

  2. H2O • H2 means 2 Hydrogen atoms • O means 1 Oxygen atom • Why?

  3. NaCl • Na - 1 Sodium • Cl - 1 Chlorine • Why?

  4. Columns = Groups Rows = Periods 1+ 2+ 3+ 4± 3- 2- 1-

  5. So what about NaCl? The goal of every atom is to be charge free. So they combine until they have a charge of 0 Sodium Chloride Na Cl +1 -1 = 0 +1 + -1 Na Cl NaCl + =

  6. That still doesn’t explain how we got H2O Hydrogen Oxygen The goal of every atom is to be charge free. So they combine until they have a charge of 0 O H -2 +1 +1 + +1 + -2 = 0 H H O HHO H2O + + = =

  7. So . . . . • What is the formula if Lithium combined with Sulfur? • Lithium has a charge of 1+ and sulfur has a charge of 2- so you would need two lithiums to make the total charge zero. • Li2S

  8. Crossover Method • Reliable way to be sure of answers for naming problems. • Radium and Iodide

  9. Big Rules • All Compounds are neutral • Charges up top (superscript);Amount on the bottom (subscript) • Reduce subscripts to their lowest ratio • Put Polyatomic ions in parenthesis so their amounts don’t get lost • SiF62- (SiF6)2-

  10. Try These • Combine: • Co2+ and CN- • Mg2+ and IO3- • Ni 2+ and I- • Ag+ and F- • Be2+ and N3-

  11. Try These • Write the chemical formula: • Magnesium Bisulfate • Hydrogen Cyanide • Beryllium Carbonate • Rubidium Nitrate • Plumbous Binoxalate

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