catalyst: draw the atomic model and lewis dot structure for f -
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Catalyst: Draw the atomic model and Lewis Dot Structure for F -. Thurs, Nov. 6 th , 2008. Today’s Objective: SWBAT. Describe what bonds are. Identify and draw atomic models of ionic compounds. Matter Classification Review. - PowerPoint PPT PresentationTRANSCRIPT
Today’s Objective: SWBAT
Describe what bonds are.
Identify and draw atomic models of ionic compounds.
Matter Classification Review
How would you describe the following two images using the following terms: atom, molecule, element, and compound.
Matter Classification Review
Both of these are molecules and compounds.
Molecule b/c 2+ atoms
Compounds b/c 2 types of elements.
Ionic Bonds – Thurs, 11.06.2008
Matter Review
- Molecule = 2+ atoms- Compound = 2+ types of elements
Compounds
How are compounds held together? (Brainstorm in pairs)
They are held together by forces called chemical bonds.
These bonds form as a result of valence electrons interacting b/t elements.
Ionic Bonds – Thurs, 11.06.2008
Matter Review
Bonds
-Molecule = 2+ atoms- Compound = 2+ types of elements
- Forces that hold cmpds. together- Form b/c of valence e- interacting b/t elements
Valence ReviewAs the group number on the periodic table increases (as you move to the right), what happens to the number of valence electrons? (Think first!)
Ionic Bonds – Thurs, 11.06.2008
Matter Review
Bonds
Val. e-
-Molecule = 2+ atoms- Compound = 2+ types of elements
- Forces that hold cmpds. together- Form b/c of valence e- interacting b/t elements
- As group # , val. e-
Valence ReviewAtoms WANT to have 8 electrons in their valence shell.
Which side of the periodic table would be more likely to receive electrons to make this happen?
Valence ReviewThe right side of the periodic table is more likely to receive electrons to make a full shell.
As group # increases, the ability to gain electrons, increases.
Ionic Bonds – Thurs, 11.06.2008
Matter Review
Bonds
Val. e-
-Molecule = 2+ atoms- Compound = 2+ types of elements
- Forces that hold cmpds. together- Form b/c of valence e- interacting b/t elements
- As group # , val. e- - As group # , ability to gain e-
Valence ReviewThe left side (metals) want to give away electrons & the right side (non-metals) want to accept electrons.
Valence ReviewIf an atom has few valence electrons, it wants to give them away (it is generous).
If an atom has many valence electrons, it wants to take more (it is greedy).
Ionic Bonds – Thurs, 11.06.2008
Matter Review
Bonds
Val. e-
Gaining/ Losing e-
-Molecule = 2+ atoms- Compound = 2+ types of elements
- Forces that hold cmpds. together- Form b/c of valence e- interacting b/t elements
- As group # , val. e- - As group # , ability to gain e-
-If fewer val. e-, wants to give e- away-If many val. e-, wants to take more e-
Lewis Dot Review (Left page)
What are the Lewis Dot Structures for Sodium & Chlorine?
Sodium – 1 val. e-
Chlorine – 7 val. e-
Lewis Dot Review (Left page)
Which one is more likely to give away electrons?
Sodium (has fewer val. e-)
Which one is more likely to accept electrons?
Chlorine (has more val. e-)
Ionic BondsIonic bonds occur when electrons in a compound are transferred from one atom to another.
Why?
Atoms that are more likely to give away electrons will transfer electrons to the atom that is more likely to accept electrons.
Ionic Bonds – Thurs, 11.06.2008
Val. e-
Gaining/ Losing e-
Ionic Bonds
- As group # , val. e- - As group # , ability to gain e-
-If fewer val. e-, wants to give e- away-If many val. e-, wants to take more e-
- bond formed when e- transferred from one atom to another
Ionic BondsWhen an ionic bond is formed, atoms gain or lose electrons.
What are atoms that do not have the same number of protons & electrons called?
IONS
Steps for Creating Ionic Bonds
1. Draw the Lewis Dot structure for each atom.
2. Figure out which atom is more likely to give away electrons.
3. Figure out which atom is more likely to receive electrons.
Ionic Bonds – Thurs, 11.06.2008
Gaining/ Losing e-
Ionic Bonds
Ionic Bond Steps
-If fewer val. e-, wants to give e- away-If many val. e-, wants to take more e-
- bond formed when e- transferred from one atom to another
1. Draw Lewis Dot structures.2. Figure which atom is more likely to give away electrons.3. “…” receive electrons.
Steps for Creating Ionic Bonds (Example – Left page)
1. Draw the Lewis Dot Structures for Sodium & Chlorine.
Sodium (Na): 1 val. e- Chlorine (Cl): 7 val. e-
Na Cl
Steps for Creating Ionic Bonds (Example – Left page)
2. Figure out which atom is more likely to give away electrons.
3. Figure out which atom is more likely to receive electrons.
Na Cl
Steps for Creating Ionic Bonds
4. Figure out how many electrons need to be transferred.
5. Draw an arrow showing transfer of electrons.
6. Determine and write charges of ions created.
Ionic Bonds – Thurs, 11.06.2008
Ionic Bond Steps
1. Draw Lewis Dot structures.2. Figure which atom is more likely to give away electrons.3. “…” receive electrons.4. Figure # e- to be transferred.5. Draw arrow showing e- moving.6. Write charges of new ions.
Steps for Creating Ionic Bonds (Example – Left page)
4. Figure out how many electrons need to be transferred.
1e- to be transferred
Na Cl
Steps for Creating Ionic Bonds (Example – Left page)
5. Draw an arrow showing transfer of electrons.
Na Cl
Steps for Creating Ionic Bonds (Example – Left page)
6. Determine and write charges of ions formed.
Na Cl
+ -
Steps for Creating Ionic Bonds (Example 2 – Left page)• Create an ionic bond between
Sodium (Na) and Flourine (F). (Take 3 minutes)
Steps for Creating Ionic Bonds (Example 2 – Left page)1. Draw Lewis Dot structures.
2. Figure which atom is more likely to give away electrons.
3. “…” receive electrons.
4. Figure # e- to be transferred.
5. Draw arrow showing e- moving.
6. Write charges of new ions.
Na F
Steps for Creating Ionic Bonds (Example 2 – Left page)1. Draw Lewis Dot structures.
2. Figure which atom is more likely to give away electrons.
3. “…” receive electrons.
4. Figure # e- to be transferred.
5. Draw arrow showing e- moving.
6. Write charges of new ions.
Na F
Steps for Creating Ionic Bonds (Example 2 – Left page)1. Draw Lewis Dot structures.
2. Figure which atom is more likely to give away electrons.
3. “…” receive electrons.
4. Figure # e- to be transferred.
5. Draw arrow showing e- moving.
6. Write charges of new ions.
Na F
Steps for Creating Ionic Bonds (Example 2 – Left page)1. Draw Lewis Dot structures.
2. Figure which atom is more likely to give away electrons.
3. “…” receive electrons.
4. Figure # e- to be transferred. (1)
5. Draw arrow showing e- moving.
6. Write charges of new ions.
Na F
Steps for Creating Ionic Bonds (Example 2 – Left page)1. Draw Lewis Dot structures.
2. Figure which atom is more likely to give away electrons.
3. “…” receive electrons.
4. Figure # e- to be transferred. (1)
5. Draw arrow showing e- moving.
6. Write charges of new ions.
Na F
Steps for Creating Ionic Bonds (Example 2 – Left page)1. Draw Lewis Dot structures.
2. Figure which atom is more likely to give away electrons.
3. “…” receive electrons.
4. Figure # e- to be transferred. (1)
5. Draw arrow showing e- moving.
6. Write charges of new ions.
Na F
+ -
Sample Problems (on white boards)
Draw the ionic bonds between the following elements:
1. Potassium & Flourine
2. Potassium & Chlorine
3. Hydrogen & Flourine
4. Chlorine & Hydrogen
5. Atom “X” with 6 valence electrons & Atom “Y” with 2 valence electrons.
6. Atom “Aa” with 5 total electrons & Atom “Bb” with 7 total electrons.