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Compared to Bohr, the electron cloud model is better for:
 
Predicting chemical behavior
 
Explaining hydrogen spectra only<br>
 
Ignoring energy levels
 
Describing photons
Scientists only need one model to explain all atomic behavior.
 
False
 
True
Observable phenomena of atoms include:
 
Both a and b
 
Spectral lines
 
Photoelectric effect
 
Neither
Which model best predicts chemical behavior and probabilistic electron locations?
 
Electron cloud
 
Bohr
 
Classical
 
Dalton
Photon emission occurs when an electron absorbs energy and jumps to a higher level.
 
False
 
True
Which parts of the atom interact to produce spectral lines?
 
Nucleus and electrons
 
&nbsp;Only the nucleus
 
Only photons
 
Neutrons and photons
Which formula represents photon energy?
 
E = hf
 
E = mc²
 
F = ma
 
V = IR
Einstein explained the photoelectric effect using:
 
Photon theory (light as particles)
 
Continuous wave theory
 
Bohr’s orbitals
 
Classical electricity
Increasing light intensity can eject electrons if the frequency is too low.
 
False
 
True
In the photoelectric effect, electrons are ejected when:
 
Light frequency is above threshold
 
Light intensity is high enough
 
Any light shines on the metal
 
Metal is hot
The electron cloud model keeps quantized energy levels.
 
True
 
False
The electron cloud model shows electrons as:
 
Probability regions
 
Fixed orbits
 
Stationary particles
 
Circling nuclei like planets
Which of the following is a limitation of Bohr’s model?
 
Cannot explain multi-electron atoms
 
Cannot predict hydrogen spectrum
 
Does not have energy levels
 
Ignores the nucleus
What happens when an electron jumps from a higher to a lower energy level?
 
A photon is emitted
 
A photon is absorbed
 
Electron disappears
 
Nothing happens
Bohr’s model works perfectly for multi-electron atoms.
 
False
 
True
Electron transitions in Bohr’s model produce:
 
Discrete spectral lines
 
Continuous radiation
 
No energy
 
Only infrared light
In Bohr’s model, electrons:
 
Move in fixed circular orbits
 
Exist only in a cloud
 
Can have any energy
 
Are stationary
Classical physics could explain discrete spectral lines.
 
False
 
True
According to classical physics, atoms should:
 
Collapse due to spiraling electrons
 
Be stable
Classical physics predicted that electrons orbit the nucleus like:
 
Planets around the sun
 
Satellites randomly
 
Particles in a cloud
 
Fixed points
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