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What can happen when an atom absorbs energy?
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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agreed with Rutherford’s model but added something to it
4.3 Modern Atomic Theory Niels Bohr ( ) 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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when it loses the energy it emits it as light
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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Electron Cloud Model of a Hydrogen Atom
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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orbital – region of space where an electron is likely to be found
4.3 Modern Atomic Theory orbital – region of space where an electron is likely to be found
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Energy Level, Orbitals, and Electrons
4.3 Modern Atomic Theory electron cloud – a good approximation of how electrons behave in their orbitals Energy Level, Orbitals, and Electrons Energy Level Number of Orbitals Maximum # of Electrons 1 2 4 8 3 9 18 16 32
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atoms emit light when their electrons return to ground state
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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electron configuration energy levels
Chapter 4 Vocabulary isotopes proton nucleus mass number electron configuration energy levels atomic number neutron orbital electron cloud electron ground state excited state
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isotopes proton nucleus mass number energy levels atomic number
Chapter 4 Vocabulary isotopes proton nucleus mass number energy levels atomic number neutron orbital electron cloud electron ground state excited state
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isotopes proton mass number energy levels atomic number neutron
Chapter 4 Vocabulary isotopes proton mass number energy levels atomic number neutron orbital electron cloud electron ground state excited state
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isotopes proton mass number energy levels atomic number orbital
Chapter 4 Vocabulary isotopes proton mass number energy levels atomic number orbital electron cloud electron ground state excited state
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isotopes proton mass number energy levels atomic number electron cloud
Chapter 4 Vocabulary isotopes proton mass number energy levels atomic number electron cloud electron ground state excited state
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isotopes proton mass number energy levels atomic number electron cloud
Chapter 4 Vocabulary isotopes proton mass number energy levels atomic number electron cloud electron ground state
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isotopes proton mass number energy levels electron cloud electron
Chapter 4 Vocabulary isotopes proton mass number energy levels electron cloud electron ground state
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proton mass number energy levels electron cloud electron ground state
Chapter 4 Vocabulary proton mass number energy levels electron cloud electron ground state
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proton mass number electron cloud electron ground state
Chapter 4 Vocabulary proton mass number electron cloud electron ground state
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Chapter 4 Vocabulary proton electron cloud 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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