Lesson Worksheet: Modern Atomic Theory Chemistry
In this worksheet, we will practice describing the concepts of modern atomic theory.
Q1:
Who first introduced the uncertainty principle?
- APauli
- BDe Broglie
- CDirac
- DSchrödinger
- EHeisenberg
Q2:
Which of the following is not a limitation of the Bohr model of the atom?
- AElectrons move around the nucleus in circular, planar orbits.
- BElectrons are only considered as particles and not as waves.
- CIt is possible to precisely determine the position and momentum of an electron simultaneously.
- DElectrons within atoms can only occupy quantized energy levels.
- EIt explains the line emission spectrum of the hydrogen atom only.
Q3:
Which of the following is true about an electron?
- AIt is located farther from the nucleus when excited.
- BIt absorbs energy when it moves from an excited state to the ground state.
- CIt is located in the nucleus when excited.
- DIt is located closer to the nucleus when excited.
Q4:
Which of the following is correct when the electron in an atom acquires a quantum of energy by heat or by electric discharge?
- AThe electron jumps to a higher energy level and stays there without emission of energy.
- BThe electron jumps temporarily to a higher energy level, then it returns to its original level with an emission of a lower quantum of energy.
- CThe electron jumps temporarily to a higher energy level, then it returns to its original level with an emission of the same quantum of energy.
- DThe electron jumps temporarily to a higher energy level, then it returns to its original level with an emission of a higher quantum of energy.
Q5:
The graph shows the probability of finding the electron at a distance from the nucleus in the 1s orbital of an atom of hydrogen. At what approximate distance is the electron most likely to be found from the nucleus?
Q6:
Who established the quantum mechanical model of the atom?
- ABohr
- BRutherford
- CDalton
- DSchrödinger
- EHeisenberg
Q7:
Who created an equation that could describe the electron wave motion in the atom?
- AHeisenberg
- BBohr
- CDalton
- DSchrödinger
- EDe Broglie
Q8:
According to the modern atomic theory, which of the following is correct?
- AThe electron behaves as a wave only.
- BThe electron behaves both as a material particle and as a wave.
- CThe electron moves in a fixed circular orbit round the nucleus.
- DThe electron behaves as a material particle only.
Q9:
During the transition of an electron in a hydrogen atom, photons are produced. Which transition will produce photons of the shortest wavelength if you know that the photon's wavelength is inversely proportional to its energy?
- A
- B
- C
- D
Q10:
discovered that the determination of both the position and the velocity of an electron at the same time is practically impossible.
- AHeisenberg
- BSchrödinger
- CDe Broglie
- DBohr
- ERutherford
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