It’s all about e - (if I were an electron, I would be….) 1. light weight particle; 1/2000th an...
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Transcript of It’s all about e - (if I were an electron, I would be….) 1. light weight particle; 1/2000th an...
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It’s all about e-
(if I were an electron, I would be….)
1. light weight particle; 1/2000th an atomic mass unit (amu).2. (-) negatively charged particle.3. loosely bound; American Heritage Dictionary defines loose as
• not fastened; unbound.4. attracted to (+) positively charged particles; opposites attract.5. repelled by other negatively charged particles; like charges repel.6. dynamic not static; I’d would move about or jump around.7. a traveler and would love to travel but never far from home.8. at home within an electron shell shown by Bohr’s model.9. easily excitable.
Handout given in class
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the Vandegraph generator
⊕⊕⊕⊕⊕⊕
Electrons are Not STACTIC,
They JUMP
2. (-) negatively charged particle3. loosely bound4. attracted to (+) positively charged particles5. repelled by other negative charged particles6. dynamic not static
Opposite charges attract!!!
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What precautions should you take when filling containers madefrom materials that arenonconductors, •plastic, •rubber or •glass?????
Fill’er up & Check the oil...
So…be grounded in your knowledge of chemistry
Place the container on the ground
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GasPUMP
⊕⊕
⊕
⊕⊕
⊕⊕
⊕
A metal ground wire place between the metal chassy of the car and the metal gas pump to neutralize charge build up.
2. (-) negatively charged3. loosely bound;4. attracted to (+) positive charges5. repelled by other negative charges6. dynamic not static; they jump
As gasoline flows through the plastic hose, a dangerous and potentially lethal static charge is produced.
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GasPUMP
⊕⊕
⊕
⊕⊕
⊕⊕
⊕
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• metals are conductorsallowing electrons to travel
• plastics, glass, rubber are insulators & prevent (insulate) electrons from traveling
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GasPUMP
⊕⊕
⊕
⊕
⊕
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A plastic container not properly grounded can be lethal.
Plastic, rubber and glass containers are not easily grounded
Plastic, rubber and glass are nonconductor insulators of charge
Rubber tires (insulator)
Plastic container (insulator)
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GasPUMP
⊕⊕
⊕
⊕
⊕
⊕
⊕
⊕⊕
Place a plastic, glass, rubber container on the ground when filling with gasoline or other solvents.
A plastic container that is not properly grounded is lethal.
Plastic and glass containers are nonconducting insulators of charge, and are not easily grounded
GROUND
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GasPUMP
⊕⊕⊕
⊕⊕⊕
⊕⊕
⊕
Electrons seek ground
Place a plastic, glass, rubber container on the ground when filling with gasoline or other solvents.
A plastic container that is not properly grounded is lethal.
Plastic and glass containers are nonconducting insulators of charge, and are not easily grounded
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Electrons are at home within an electron shell shown by Bohr’s model
"Electron Shells"
1. At the center of the home is a dense positively charged nucleus.2. About the positively charged nucleus are electron shells.3. Electron shells are represented by “ nth ” levels (quantum levels)
⊕n = 1
n = 2
n = 3
n = 44. Quantum level means “discrete energy level.”
A solar system type model
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Electrons have a home in a given shell
"Electron Shells"
n = 1
n = 2
n = 3
n = 4
The maximum number of Electrons per shell is givenby 2(n)2
2(1)2 = 2
2(2)2 = 8
2(3)2 = 18
2(4)2 = 32
Bohr’s Model for atoms
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"Electron Shells"
n = 1
Bohr’s Model for a hydrogen atom, 1H,
atomic number 1, one electron
Where is hydrogen’s one electron located??????
•
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"Electron Shells"
n = 1
Bohr’s Model for a helium atom, 2He,
atomic number 2, two electrons
Where are helium’s two electrons located??????
••
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"Electron Shells"
n = 1•• 2(1)2 = 2
2(2)2 = 8
The maximun number of Electrons per shell is givenby 2(n)2
Bohr’s Model for a neon atom, 10
Ne,
atomic number 10, ten electrons
Where are neon’s ten electrons located??????
••
••
n = 2
••
••
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"Electron Shells"
Bohr’s Model for a carbon atom
Where are the six electrons for carbon located??????
n = 1•• •
••
•n = 2
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"Electron Shells"
Bohr’s Model for a beryllium , Be, atom
Where are the four electrons for beryllium located??????
n = 1••
•
•n = 2
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Electrons are easily excitable
The glowing pickle demonstration
⊕⊕⊕
energyabsorbed light
emitted
excitedstate
groundstate
groundstate
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Atomic Emission Spectra and Flame TestsDr.Gergens - SD Mesa College
I. It is all about "e-" (electrons)1. light weight particle; 1/2000th an atomic mass unit (amu)
2. (-) negatively charged particle
3. loosely bound; American Heritage Dictionary defines loose as
• not fastened; unbound
4. attracted to (+) positively charged particles
5. repelled by other negatively charged particles
6. dynamic not static; I’d would like to move about or jump around
7. a traveler and would love to travel but never far from home
8. at home within an electron shell shown by Bohr’s model
9. easily excitable
II. Bohr's Model
Unique Electron Configuration
III. Absorption versus Emission
A. Ground State versus Excited State
10Ne
NeHe
2He1H
H