Lesson Worksheet: Modern Atomic Theory Chemistry
In this worksheet, we will practice describing the concepts of modern atomic theory.
Who first introduced the uncertainty principle?
- BDe Broglie
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.
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.
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.
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?
Who established the quantum mechanical model of the atom?
Who created an equation that could describe the electron wave motion in the atom?
- EDe Broglie
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.
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?
discovered that the determination of both the position and the velocity of an electron at the same time is practically impossible.
- CDe Broglie