1. The basis of the VSEPR model of molecular bonding is a) regions of electron d
ID: 1018917 • Letter: 1
Question
1. The basis of the VSEPR model of molecular bonding is
a) regions of electron density on an atom will organize themselves so as to maximize s-character.
B) regions of electron density in the valence shell of an atom will arrange themselves so as to maximize overlap.
C) atomic orbitals of the bonding atoms must overlap for a bond to form.
D) electron domains in the valence shell of an atom will arrange themselves so as to minimize repulsions.
E) all of the above
2.Which of the following elements cannot possess an expanded valence shell;
a) bromine b) selenium c) sulfur d) nitrogen e) arsenic
3. What is the electron configuration for the ferrous cation, Fe2+?
A)1s22s22p63s23p63d6 B) 1s2 2s2 2p6 3s2 3p6 4s2 3d4
C) 1s2 2s2 2p6 3s2 3p6 3d8 D) 1s2 2s2 2p6 3s2 3p6 4s2 3d8
E) 1s2 2s2 2p6 3s2 3p6 4s2 3d5
4. How many resonance structures, if any, can be drawn for sulfur dioxide, SO3?
a) one b) two c) three d) four e) zero (no resonance)
5. Which basic arrangement would best accommodate five electron domains in the valence shell of a covalently bonded atom?
a) planar trigonal b) octahedral c) tetrahedral d) linear e) trigonal bipyramidal
Explanation / Answer
1. E) all of the above
2. d) nitrogen
N= 1s22s22p3
In nitrogen valency shell has no d- orbital. So nitrogen cannot expanded valency shell.
3. A)1s22s22p63s23p63d6
Fe = 261s22s22p63s23p63d6 4s2
Fe --------------> Fe2+ + 2e-
4. c) three
5.e) trigonal bipyramidal
AX5 type arrangement . No lone pair of electrons on valency shell .So shape of molecule is trigonal bipyramidal.
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