atomic spectrum ccp
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Bell Work AgendaNotes: Atomic Spectrum
Flame Test demo
Bohr Model Practice
• What is the difference between a conceptual and a physical model?
• What scientists have a conceptual model? A physical model?
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Atomic SpectrumMarch 27, 2013
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Objectives1. Explain why scientists know the identity of
the chemical compositions of stars2. Describe a flame test3. Describe the Bohr model in terms of
energy
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Atoms can absorb and release energy
When atoms release energy they emit light
Each atom emits only a certain frequency of light
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When electrons absorb energy they get excited and jump around
When jump back to the original position they release that energy as light
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Flame Test Na Li B Cu Ca
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Quantum hypothesis beam of light is both wave and stream of
particles – photons
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Spectroscope White light separates into its color
components by a prism
Each color corresponds to a different frequency of electromagnetic radiation
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Spectroscope Observe color components of any light
source
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Atomic Spectrum Light from atoms consist of a number of
individual frequencies rather than a continuous spectrum
Pattern of frequencies of a particular element – atomic spectrum
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Atomic spectrum – atoms “finger print”
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Shell model A region of space around the atomic
nucleus where electrons may be
Each shell can hold a limited amount of electrons
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Series of seven shells accounts for the seven periods
Number of electrons held in each period is equal to the shell’s capacity for electrons
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Valence Electrons Electrons in the outermost shell “combining
power”
Directly exposed to the external environment
The first to interact with other atoms