# Worksheet: Atomic Models

Q1:

Rutherford investigated the properties of the atomic nucleus by firing particles at atoms of gold and measuring their deflection. How would the results of this experiment differ if neutrons were used instead of particles?

• ANeutrons would not be deflected because they have no charge, so they are not attracted electrostatically to the electrons of the gold atoms.
• BNeutrons would be deflected less because they are smaller than particles and, therefore, less likely to collide with the nuclei of the gold atoms.
• CNeutrons would be deflected more because they are smaller than particles and therefore less likely to bind with the nuclei of the gold atoms.
• DNeutrons would not be deflected because they have no charge, so they are not repelled electrostatically by the nuclei of the gold atoms.
• ENeutrons would appear to be deflected more, as collisions with the gold nuclei would cause neutrons to be emitted over a wide range of angles.

Q2:

Which of the following accurately defines the quantization of electron energies within an atom?

• AThe energies of two electrons cannot be equal.
• BAn electron can possess any energy within a certain range.
• CThe total electron energy is fixed.
• DAn electron can possess only certain discrete energy values.
• EOnly one electron can undergo a change in energy.

Q3:

Which of the following statements is false?

• AElectrons in the quantum mechanical model of the atom can exist in any finite volume of space.
• BThe non-quantized electron orbits of the Rutherford model of the atom would not be stable.
• CIn both the Bohr and quantum mechanical models of the atom, the energy of an electron is described by quantum numbers with discrete values.
• DIn both the Bohr and quantum mechanical models of the atom, the position of an electron is described by quantum numbers with discrete values.
• EIn the Rutherford, Bohr and quantum mechanical models of the atom, most of the volume of an atom contains infinitesimal mass.

Q4:

Which of the following statements is true?

• AIn the Bohr model of the atom, it is possible for electrons to have zero angular momentum.
• BIn the quantum mechanical model of the atom, the distance of an electron from the atomic nucleus is quantized.
• CThe electron in a hydrogen atom has different energies in the Bohr and quantum mechanical models of the atom.
• DThe electron orbits of the Bohr model of the atom violate the Heisenberg uncertainty principle.
• EOnly the quantum mechanical model of the atom can account for the discrete lines of an atomic emission spectrum.