The document is the notes from an atomic spectrum class that include the agenda, objectives, and content about atomic spectra. The key points are: 1. Atoms emit and absorb specific frequencies of light that make up their atomic spectrum, which acts as a fingerprint to identify elements. 2. Flame tests can identify elements based on the color of light they emit. 3. The Bohr model describes electrons absorbing and emitting energy in quantized levels as they move between orbits, releasing photons of specific frequencies.

1. Bell Work Agenda
Notes: Atomic Spectrum • Have HW out to be
checked
Lewis dot structure • Pick up Bohr Model WS
and complete

2. Atomic Spectrum
January 4, 2013

3. Objectives
1. Explain why scientists know the identity of
the chemical compositions of stars
2. Describe a flame test
3. Describe the Bohr model in terms of
energy

4.  Atoms can absorb and release energy
 When atoms release energy they emit light
 Each atom emits only a certain frequency
of light

5.  When electrons absorb energy they get
excited and jump around
 When jump back to the original position
they release that energy as light

6. Flame Test
Na Li B Cu Ca

7. Quantum hypothesis
 beam of light is both wave and stream of
particles – photons

8. Spectroscope
 White light separates into its color
components by a prism
 Each color corresponds to a different
frequency of electromagnetic radiation

9. Spectroscope
 Observe color components of any light
source

11. 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

12.  Atomic spectrum – atoms “finger print”
 Emission – the frequencies the gas emitts
 Absorption – frequencies of all white light
EXCEPT those that are absorbed by the
gas

14. •
 Emission
 Absorption

15.  http://jersey.uoregon.edu/vlab/elements/Elemen

16. Shell model
 A region of space around the atomic
nucleus where electrons may be
 Each shell can hold a limited amount of
electrons

17.  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

19. Valence Electrons
 Electrons in the outermost shell “combining
power”
 Directly exposed to the external
environment
 The first to interact with other atoms