DEVELOPMENT OF A NEW ATOMIC MODEL
I. Behavior
of electrons related to absorption and emission of light
A. ____________________: taking in energy
B. ____________________: giving off/releasing
energy
II. Properties of light
A.
Light as a wave
1. Light = form of electromagnetic (EM) radiation
2. All types of EM radiation together make up
the EM ___________________
a. all types move at
the speed of light (c = 3.00 x 108 m/s)
b. all have
____________________ (distance between same pt. on different waves -
measured in ____ - abbreviated ____)
c. all have
____________________ (# of waves that pass a certain point in 1 sec. -
measured in ____ - abbreviated ____)
d. c = l . n
e. frequency and
wavelength are ___________________ proportional
III. Photoelectric effect
A. Emission of e- from a metal when light shines
on the metal
B. Only light of certain frequency could cause
the photoelectric effect
1. Wave theory alone could not explain this
2. Light as particles
a. Object emits energy in small, specific
amounts (called ______________)
b. Suggested
by ____________________
c. E = h . n
1) E =
2) h =
3) n =
d. energy and frequency
are ____________________ proportional
C. Einstein suggested that light had properties
of both waves and particles
Referred to
as the ________________________________________ of light
D.
_________________: particle of EM radiation carrying a quantum of energy
IV. Hydrogen atom line emission spectrum
A. ____________________: lowest energy state of an atom
B. ____________________: atom has higher potential energy than in
ground state
C. Light (of a certain amount of energy) shone
through a prism, separated into
specific frequencies of light (corresponds
to different colors)
D. Quantum theory
1.
When atom falls from excited state to ground state,
__________________
____________________________________________________________
2. Energy of photon = difference
___________________________________
____________________________________________________________
3. Energy states of atoms are fixed
V. Bohr model
of the hydrogen atom
A. said that e- circled the nucleus in fixed paths
B. when in path, has
fixed amount of energy
C. e- cannot exist in
space between paths
D. drawback of Bohr’s
model =