11/9/2020
Which of the following is/are explained by Bohr's model?
(a), (b) and (d) are correct
In an atom, the second energy level contains 4 orbitals. What is the maximum number of electrons that can fill the second energy level?
8 electrons
What percentage chance is there of finding the electron within a particular orbital?
90 %
What happens when an electron in a hydrogen atom moves from the excited state to the ground state?
A photon is emitted.
Bohr's model predicts the hydrogen atom could emit electromagnetic radiation which can be observed in the _____ region.
All of the above
Which of the following can be used to outline the probability of finding an electron in the given space around a nucleus?
All of the above
Which of the following statements is(are) incorrect?
All of the above
Which statement(s) are true about valence electrons?
Atoms are stable when they have as many valence electrons as possible. Atoms readily lose or gain valence electrons in order to achieve a full outer energy level. Valence electrons determine many of the properties of an atom.
What electron transition series corresponds to the emission of visible light?
Balmer series
According to the Bohr model of an atom:
Both A and C
Bohr used a mixture of _____ to study electronic spectrums.
Classical and quantum physics
Which of the following electronic jumps in a hydrogen atom will require the most energy?
From n=1 to n=2
Bohr was able to explain the spectra of the:
H atom
Which energy level around the nucleus of an atom has the lowest energy?
I
An atomic emission spectra consists of _____.
lines of different frequencies
To move from the ground state to the excited state, an electron:
must absorb one or more quanta of energy
Electron transitions within the hydrogen atom are grouped based on the ending energy level of the transition. Choose the name of the electron transition series of the hydrogen atom to the ending energy level.
n=1
Electron transitions within the hydrogen atom are grouped based on the ending energy level of the transition. Choose the name of the electron transition series of the hydrogen atom to the ending energy level.
n=2
Electron transitions within the hydrogen atom are grouped based on the ending energy level of the transition. Choose the name of the electron transition series of the hydrogen atom to the ending energy level.
n=3
The sixth energy level can hold up to 32 electrons. How many orbitals are in energy level 6?
16 orbitals
When did Bohr propose his model of the atom?
1913
How many electrons can an orbital hold?
2 electrons
Hydrogen's spectrum consists of ____ lines of visible light.
4
In the emission spectrum of helium, which has 2 electrons, we see _____.
5 colors
Which of the following would decrease the frequency of light?
Decrease the energy.
Bohr considered electrons as _____.
Discrete particles
What happens when an atom that is in its ground state is supplied with energy?
Electron(s) move from lower energy levels to higher energy levels.
Which of the following is true according to the Bohr model of the atom?
Electrons orbit the nucleus in definite orbits.
The difference in energy between the n=1 and the n=2 energy levels of a hydrogen atom is 1.64×10−18 J . What happens when an electron transitions from n =2 to n =1?
Exactly 1.64×10−18 J of energy is released.
Absorption spectra are produced when an excited electron returns back to its ground state.
FALSE
According to Bohr's model of the atom, orbits closer to the nucleus would require the electrons to have a greater amount of energy, and orbits farther from the nucleus would require the electrons to have a smaller amount of energy.
FALSE
According to Bohr, electrons move in an orbital.
FALSE
Bohr's model was a complete failure and could not provide insights for further development in atomic theory.
FALSE
Bohr's model was successful for atoms which have multiple electrons.
FALSE
Electrons present in the orbits closer to the nucleus have larger amounts of energy.
FALSE
Line spectrum is also known as the absorption spectrum.
FALSE
The emission spectrum of a chemical element is the pattern of wavelengths obtained when the element is subjected to a specific excitation.
FALSE
The ground state of an atom, has the higher energy state.
FALSE
We cannot identify elements by using their emission spectrum.
FALSE
Which energy level has the highest energy?
IV Energy Level
Which of the following will increase the energy of a photon?
Increase the frequency of the photon
What happens when an electron jumps from a higher energy level to a lower energy level?
It emits a specific wavelength distinct to that element
What was the difficulty with Bohr's model of the atom?
It only explained the atomic emission spectrum of hydrogen.
Which of the following is a shortcoming of Bohr's theory?
It was only successful for atoms which have a single electron
The following answer choices represent electron jumps between energy levels K-N, where K is the lowest energy level and N is the highest energy level. Which electron jump(s) would require energy to be absorbed?
K → L M → N
Which statement best describes the conclusion of Einstein's experiment on the photoelectric effect?
Light behaves as both a particle and a wave.
In an electric discharge, the emission spectra of helium is an example of _____.
Line spectra
If light is shining on a metal surface above the threshold frequency, what would happen if the intensity of the light were increased?
More electrons would be ejected from the metal surface.
The following answer choices represent electron jumps between energy levels K-N, where K is the lowest energy level and N is the highest energy level. Which electron jump(s) would result in light being released?
N → L M → L
A model of the atom which explained the atomic emission spectrum of hydrogen was proposed by _____.
Neils Bohr
Can the electron occupy any space between the orbits?
No
Does the Bohr model work for atoms other than hydrogen?
No
In the hydrogen atom's spectrum, series lines are found at 12,186.3 cm−1 . The hydrogen atom belongs to the _____ series.
Paschen
Which statement(s) is/are TRUE about photons?
Photons are particles of light. Photons have zero mass. Photons carry a very specific quantum of energy.
A high density electron cloud suggests that there is a high probability of the electron being in that region of space.
TRUE
According to the Bohr model of atoms, electrons occupy definite orbits.
TRUE
An atom is said to be in an excited state when it possesses more energy than when it is in its ground state.
TRUE
An emission line spectrum is produced by low-density hot gases.
TRUE
Bohr's theory explained the line spectra of the hydrogen atom.
TRUE
Each element produces a unique atomic emission spectrum.
TRUE
Electrons cannot exist at the spaces in between the Bohr orbits.
TRUE
Emission lines are seen when electrons return to the ground state, releasing light.
TRUE
Energy is absorbed when an electron jumps from a lower energy level to high energy level.
TRUE
Light is emitted by an electron when it loses energy and returns to the ground state.
TRUE
Niels Bohr proposed that electrons circled the nucleus of an atom in a planetary-like motion.
TRUE
Quantization of electron energy levels is a requirement in order for Schrödinger's wave equation to be solved.
TRUE
The energy released when an electron jumps from the excited state to the ground state is equal to the difference between the two levels.
TRUE
The key idea in the Bohr model of the atom is that electrons occupy definite orbits which require the electron to have a specific amount of energy.
TRUE
To view the atom in quantum mechanical terms it requires the electron energies to be quantized.
TRUE
What quality of an electron was key to Erwin Schrödinger's development of the wave equation?
its wave-particle duality
Which statement correctly describes the energy that is absorbed by an atom?
The energy that can be absorbed by an atom is quantized.
The region A above best describes:
The location where an electron will most likely be found
Which statement best describes the orbits of the electrons according to the Bohr model?
The orbits are at fixed distances from the nucleus.
What happens to the spacing between energy levels in the hydrogen atom as one proceeds further and further from the nucleus?
The spacing between energy levels decreases.
What would an atomic emission spectrum look like if the electron's energy levels in an atom were NOT quantized?
The spectrum would be continuous.
The electron cloud can be visualized as many hundreds of dots around the central atomic nucleus. What does each dot represent?
a location where an electron could be at any given moment
The photoelectric effect occurs when light is shown on which of the following objects?
aluminum foil
When light released as a result of electrons falling back down to the ground state is viewed through a spectroscope (prism), the result is called a(n) _____.
atomic emission spectrum
Planck and Einstein showed that light behaved as:
both a wave and a particle
Where, relative to the nucleus, is the ground state of a hydrogen atom?
closest to the nucleus
The photoelectric effect occurs when light hitting a metal causes a(n) _______ to eject form the surface of the metal.
electron
Bohr suggested that an atomic spectrum is created when the _____ in an atom move between energy levels.
electrons
_____ spectrum is formed when atoms or molecules are de-excited from higher energy level to lower energy level.
emission
If an electron jumps from a higher energy level to a lower energy level, energy will be _____.
emitted
In Bohr's model, electrons exist in orbits around the nucleus which only exist at fixed distances from the nucleus called __________ levels.
energy
When an electron in an atom moves from high to low energy levels:
energy is emitted as electromagnetic radiation
In the Bohr model of the atom, what is the term for fixed distances from the nucleus of an atom where electrons may be found?
energy levels
When an electron is in the __________ state, it has a higher potential energy than it does in the ground state.
excited
The state of the atom in which one or more electrons occupy a higher energy level is called the _____.
excited state
The hydrogen spectrum has ____ lines.
four
A tube filled with gas through which electricity is passed is called a(n) _____.
gas discharge tube
a ___________ state is when the electron is closest to the nucleus.
ground
Electron transitions within the hydrogen atom are grouped based on the ending energy level of the transition. Choose the name of the electron transition series of the hydrogen atom to the ending energy level.
n=4
Where, in general, is the region of highest electron density?
near the nucleus.
Energy levels are fixed distances from the _________ of an atom where electrons are found.
nucleus
In Bohr's model, electrons exist in orbits around the nucleus which only exist at fixed distances from the nucleus called __________ levels
orbit
study of the ________________ effect helped convince scientists that light could behave as both a particle and a wave.
photoelectric
Bohr's atomic model is also commonly called the _____ model.
planetary
Energy is transmitted only in indivisible, discrete quantities called
quanta
The discrete amounts of energy that can be absorbed or released by an atom as an electron changes energy levels are called _____.
quanta
Bohr proposed electrons orbit at fixed distances from the nucleus in ______________ states, such as the ground state or excited state.
stationary
Electrons in the outermost energy level are called _____ electrons.
valence
a ________ function gives the probability of an electron being in a specific region.
wave
What are the solutions to the Schrödinger wave equation called?
wave functions
