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Writing Ionic Compounds

Writing Ionic Compounds. The “Swap & Drop” Method. Why do atoms form ions?. All atoms want to gain stability. We need to look at the valence electrons of each atom. Valence Electrons: Electrons in the outermost energy level. All atoms want to get to eight valence electrons to become stable.

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Writing Ionic Compounds

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  1. Writing Ionic Compounds The “Swap & Drop” Method

  2. Why do atoms form ions? • All atoms want to gain stability. • We need to look at the valence electrons of each atom. • Valence Electrons: Electrons in the outermost energy level. • All atoms want to get to eight valence electrons to become stable. • “8 is Great!!!”

  3. Look at Group 1! All group 1 elements have 1 valence electron. Is it easier for them to lose 1 electron, or try to gain 7 electrons? LOSE 1 ELECTRON! +1 ion

  4. Look at Group 2! All group 2 elements have 2 valence electron. Is it easier for them to lose 2 electrons, or try to gain 6 electrons? LOSE 2 ELECTRONS! +2 ion

  5. Look at Group 3! All group 3 elements have 3 valence electron. Is it easier for them to lose 3 electrons, or try to gain 5 electrons? LOSE 3 ELECTRONS! +3 ion

  6. Look at Group 4! All group 4 elements have 4 valence electron. Because 4 is in the middle, we usually just call all Group 4 Ions +4 LOSE 4 ELECTRONS! +4 ion

  7. Look at Group 5! All group 5 elements have 5 valence electron. Is it easier for them to lose 5 electrons, or try to gain 3 electrons? GAIN 3 ELECTRONS! -3 ion

  8. Look at Group 6! All group 6 elements have 6 valence electrons. Is it easier for them to lose 6 electrons, or try to gain 2 electrons? GAIN 2 ELECTRONS! -2 ion

  9. Look at Group 7! All group 7 elements have 7 valence electrons. Is it easier for them to lose 7 electrons, or try to gain 1 electron? GAIN 1 ELECTRON! -1 ion

  10. Look at Group 8! All group 8 elements have 8 valence electrons. 8 is GREAT!!! No Ions Needed!!!

  11. Swap & Drop Method For Ionic Compounds Only! Potassium Ion K Chlorine Ion Cl - + 1 1 Step 1: Drop the signs.

  12. Swap & Drop Method Potassium Ion K Chlorine Ion Cl 1 1 Step 2: Swap Values.

  13. Swap & Drop Method Potassium Ion K Chlorine Ion Cl 1 1 1 1 Step 3: Drop Values to Subscripts.

  14. Swap & Drop Method Potassium Ion K Chlorine Ion Cl Potassium Chloride Step 4: When the values are the same, then they can be erased. The number (1) is never required.

  15. Swap & Drop Method Aluminum Ion Al Oxygen Ion O - + 3 2 Step 1: Drop the signs.

  16. Swap & Drop Method Aluminum Ion Al Oxygen Ion O 3 2 Step 2: Swap Values.

  17. Swap & Drop Method Aluminum Ion Al Oxygen Ion O 2 3 2 3 Step 3: Drop values to subscripts.

  18. Swap & Drop Method Aluminum Ion Al Oxygen Ion O 2 3 AluminumOxide Step 4: Combine into compound.

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