Answers
Multiple Choice Free Response Answers for Modern Physics
1
A) Write the full Electron Configuration of Germanium.
Ge: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p2
B) Write the Abbreviated Version,
Ge: [Ar] 4s2 3d10 4p2
C) Write the Quantum Numbers of Germanium,
n =4, l =1, ml =0, ms= ½,
D) Rank the Ionization Energies of Ge, Sn, P, As, Sr, from smallest to largest,
Sr< Sn <Ge<As<P
E) Rank the Atomic Sizes of Ga+, As-, Br3-, Se2-, Ge, smallest to largest,
Ga+, Ge, As-, Se2-, Br3F) Explain the ranking in E’
In an isoelectric series (series of ions and atoms with the same number of
electrons) cations are always smaller because the ratio between Protons and
electrons is larger, meaning it has a more effective nucleus charge. The nucleus has a
greater pull on the outer-shell electrons, making the atomic radii smaller that the
neutral and anion counterparts.
2) For the molecule SCl4 consider the following:
A) Electron geometry: Trigonal bipyramidal
B) Molecular geometry: See-Saw
C) Hybridization: sp3d
3) Examine this molecule of PBr5(courtesy of wikimedia.org)
Explain the axis of the bromine atoms, and the hybridization.
A and C are in the y axis. B is in the x axis. D and E are in the z axis.SP3d2