drawing bohr models - james campbell high school...draw the bohr model for nitrogen more practice!...
TRANSCRIPT
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Bohr Models and
Lewis Dot Structures
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Bohring
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Bohr/Lewis Dot Models
Used to predict reactivity in elements
Reactivity - how likely an element is to form a compound with another element, based on valence electrons
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Drawing Bohr Models
1. Draw the nucleus.
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Drawing Bohr Models
1. Draw the nucleus.
2. Write the number of Protons and Neutrons in the nucleus
P:9
N:10
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Drawing Bohr Models
3. Draw the first shell
P:9
N:10
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Drawing Bohr Models
3. Draw the first shell
4. Add the electrons, the first shell can only hold 2
P:9
N:10
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Drawing Bohr Models
5. Draw the next shell if you
have more electrons to add
P:9
N:10
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Drawing Bohr Models6. Add your electrons, the 2nd
shell can hold up to 8
Be sure to add them one at a time going clock wise.
P:9
N:10
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Drawing Bohr Models7. Check yours Valence
electrons
P:9
N:10
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Drawing Bohr Models7. Check yours Valence
electrons
P:9
N:10
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Rules for Energy Levels
Keep adding shells until you use up all of your electrons. Here is how many each shell holds:
Shell 1: 2
Shell 2: 8
Shell 3: 18
Shell 4: 32
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Practice! Woohoo!
Draw the Bohr Model for Nitrogen
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More Practice! Yaaaaay!
Draw the Bohr Model for Boron
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But all of this is a lie….
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Rules for Energy Levels
Keep adding shells until you use up all of your electrons. Here is how many each shell holds:
Shell 1: 2
Shell 2: 8
Shell 3: 18
Shell 4: 32
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Who came up with the orbitals
that we just looked at?
Schroedinger! :D
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Lewis Dot Structures
These are more useful and we will use them
more often than Bohr models….
…created by Gilbert Lewis.
He also discovered the
covalent bond
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Drawing Lewis Dot Structures
All you need are the number of valence electrons.
Fluorine has 7 valence electrons
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Drawing Lewis Dot Structures
1. Write the letter(s) for the element to represent the nucleus.
F
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Drawing Lewis Dot Structures
2. Add the valence electrons in the same way as Bohr models, go clockwise
F
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Guided Practice
Number of Valence Electrons: _____6
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Guided Practice
Number of Valence Electrons: _____5
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Guided Practice
Number of Valence Electrons: _____1