C. Johannesson
II. Bohr Model of the Atom(p. 94 - 97)
Ch. 4 - Electrons in AtomsCh. 4 - Electrons in Atoms
C. Johannesson
C. Johannesson
Bohr's Atom: Quantum Behavior in Hydrogen
Concept Simulation - reenacts electron's 'jump' and 'fall' to precise energy levels in a hydrogen atom.
Visionlearning Viewer
C. Johannesson
A. Line-Emission Spectrum
ground state
excited state
ENERGY IN PHOTON OUT
Hydrogen Gas
Atoms are “excited”
with an electric current
C. Johannesson
B. Bohr Model
e- exist only in orbits with specific amounts of energy called energy levels
Therefore…
e- can only gain or lose certain amounts of energy
only certain photons are produced
C. Johannesson
B. Bohr Model
1
23
456 Energy of photon depends on the difference in energy levels
Bohr’s calculated energies matched the IR, visible, and UV lines for the H atom
C. Johannesson
C. Other Elements
Each element has a unique bright-line emission spectrum.
“Atomic Fingerprint”
Helium
Bohr’s calculations only Bohr’s calculations only worked for hydrogen! worked for hydrogen!
a) Electronsb) Protonsc) Neutronsd) Both (b) and (c)
According to the Bohr model of the atom, which particles are allowed to exist in any one of a
number of energy levels?
C. Johannesson
a) “jump” from a lower energy level to a higher energy level
b) “jump” from a higher energy level to a lower energy level
c) “jump” from the ground state to an excited stated) None of the above
The line-emission spectrum of an atom is caused by the energies released when
electrons
C. Johannesson
a) has no electronsb) does not release energyc) releases energy of only certain valuesd) can exist only in the ground state
Because excited hydrogen atoms always produce the same line-emission spectum, scientists
concluded that hydrogen
C. Johannesson
a) oneb) twoc) threed) four or more
Bohr’s model correctly explains the spectra of atoms with how many electron(s)?
C. Johannesson
a) absorptionb) emissionc) translationd) regression
The process of an atom releasing energy when it moves to a lower energy state is
called
C. Johannesson
a) In the orbit closest to the nucleusb) In the orbit farthest from the nucleusc) in the electron cloudd) midway between two orbits
In the Bohr model of the atom, in which orbit is an electron in its lowest energy
state?
C. Johannesson
C. Johannesson
Flame test online lab!!!!
http://www.800mainstreet.com/spect/emission-flame-exp.html
http://www.800mainstreet.com/spect/emission-flame-exp.html