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Writing Ionic Compounds The “Swap & Drop” Method.

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Presentation on theme: "Writing Ionic Compounds The “Swap & Drop” Method."— Presentation transcript:

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. GAIN 3 ELECTRONS! Is it easier for them to lose 5 electrons, or try to gain 3 electrons? -3 ion

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

9 Look at Group 7! All group 7 elements have 7 valence electrons. GAIN 1 ELECTRON! Is it easier for them to lose 7 electrons, or try to 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 Potassium Ion K Chlorine Ion Cl + - 11 Step 1: Drop the signs. For Ionic Compounds Only!

12 Swap & Drop Method Potassium Ion K Chlorine Ion Cl 11 Step 2: Swap Values.

13 Swap & Drop Method Potassium Ion K Chlorine Ion Cl 11 Step 3: Drop Values to Subscripts. 11

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

15 Swap & Drop Method Aluminum Ion Al Oxygen Ion O + - 32 Step 1: Drop the signs.

16 Swap & Drop Method Step 2: Swap Values. Aluminum Ion Al Oxygen Ion O 32

17 Swap & Drop Method Step 3: Drop values to subscripts. Aluminum Ion Al Oxygen Ion O 32 23

18 Swap & Drop Method Step 4: Combine into compound. Aluminum Ion Al Oxygen Ion O 23 Aluminum Oxide


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