3.3 Parts of an Atom Handout and highlight. Parts of an Atom.
4.3 Modern Atomic Theory What can happen when an atom absorbs energy? - an increase in kinetic...
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Transcript of 4.3 Modern Atomic Theory What can happen when an atom absorbs energy? - an increase in kinetic...
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4.3 Modern Atomic Theory
What can happen when an atom absorbs energy?
- an increase in kinetic energy or a phase change
energy may be absorbed by an atom, then emitted as light
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4.3 Modern Atomic Theory
Niels Bohr (1885-1962)
agreed with Rutherford’s model but added something to it
energy levels – the possible energies that electrons in an atom can have
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4.3 Modern Atomic Theory
when an atom gains energy an electron may move to a higher energy level
when it loses the energy it emits it as light
no two elements have the same set of energy levels, so the emit different colors of light
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4.3 Modern Atomic Theory
Electron Cloud Model
electron cloud model – model of the most likely locations for electrons in an atom (deals with probability)
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4.3 Modern Atomic Theory
Electron Cloud Model of a Hydrogen Atom
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4.3 Modern Atomic Theory
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4.3 Modern Atomic Theory
orbital – region of space where an electron is likely to be found
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4.3 Modern Atomic Theory
electron cloud – a good approximation of how electrons behave in their orbitals
Energy Level, Orbitals, and ElectronsEnergy Level, Orbitals, and Electrons
Energy LevelEnergy Level Number of Number of OrbitalsOrbitals
Maximum # of Maximum # of ElectronsElectrons
11 11 22
22 44 88
33 99 1818
44 1616 3232
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4.3 Modern Atomic Theory
electron configuration – arrangement of electrons in the orbital of an atom
ground state – electrons are all in their lowest possible energy levels (most stable)
excited state – one or more electrons are in a higher energy level than usual (least stable)
atoms emit light when their electrons return to ground state
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Chapter 4 Vocabulary
nucleus
electron cloud
neutron
proton
electron
atomic number
energy levels
ground state
mass number
isotopes
orbital
electron configuration
excited state
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Chapter 4 Vocabulary
nucleus
electron cloud
neutron
proton
electron
atomic number
energy levels
ground state
mass number
isotopes
orbital
excited state
![Page 12: 4.3 Modern Atomic Theory What can happen when an atom absorbs energy? - an increase in kinetic energy or a phase change energy may be absorbed by an atom,](https://reader035.fdocuments.in/reader035/viewer/2022062320/56649d8c5503460f94a7452e/html5/thumbnails/12.jpg)
Chapter 4 Vocabulary
electron cloud
neutron
proton
electron
atomic number
energy levels
ground state
mass number
isotopes
orbital
excited state
![Page 13: 4.3 Modern Atomic Theory What can happen when an atom absorbs energy? - an increase in kinetic energy or a phase change energy may be absorbed by an atom,](https://reader035.fdocuments.in/reader035/viewer/2022062320/56649d8c5503460f94a7452e/html5/thumbnails/13.jpg)
Chapter 4 Vocabulary
electron cloud
proton
electron
atomic number
energy levels
ground state
mass number
isotopes
orbital
excited state
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Chapter 4 Vocabulary
electron cloud
proton
electron
atomic number
energy levels
ground state
mass number
isotopes
excited state
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Chapter 4 Vocabulary
electron cloud
proton
electron
atomic number
energy levels
ground state
mass number
isotopes
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Chapter 4 Vocabulary
electron cloud
proton
electron
energy levels
ground state
mass number
isotopes
![Page 17: 4.3 Modern Atomic Theory What can happen when an atom absorbs energy? - an increase in kinetic energy or a phase change energy may be absorbed by an atom,](https://reader035.fdocuments.in/reader035/viewer/2022062320/56649d8c5503460f94a7452e/html5/thumbnails/17.jpg)
Chapter 4 Vocabulary
electron cloud
proton
electron
energy levels
ground state
mass number
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Chapter 4 Vocabulary
electron cloud
proton
electron
ground state
mass number
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Chapter 4 Vocabulary
electron cloud
proton
electron
ground state
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Chapter 4 Vocabulary
proton
electron
ground state
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Chapter 4 Vocabulary
proton
electron
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Chapter 4 Vocabulary
proton
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Chapter 4 Vocabulary
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