Select among the statements below the ones which are TRUE. There may be more than one true statement in the choices.
a. In the band model, the electrons are assumed to occupy molecular orbitals.
b. Usually, the gaseous form of a substance can still be solidified near (but not beyond) the critical point.
c. In the electron sea model, the valence electrons in metals are assumed to be fixed in the lattice points.
d. Conduction bands are closely spaced molecular orbitals with filled electron spaces.
e. In p-type semiconductors, the dopant element typically contains three-valence electrons.
Considering intermolecular forces, which of the following is INCORRECT?
a. Ammonia, NH3 : H-bonding
b. Acetone, H3C-C(=O)-CH3 : Dipole-dipole
c. Bromine, Br2 : Dispersion forces
d. Formaldehyde, H2C=O : H-bonding
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