Chapter 3: Q30 P (page 123)
The bond length in is 1.417, instead of twice the atomic radius of F, which is 1.28 Å. What can account for the unexpected length of the F-F bond?
This is due to the presence of lone pairs of electrons on fluorine atoms.
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For each of the following pairs of atoms, state which you expect to have the greater electron affinity:
(a) Xe or Cs;
(b) Pm or F;
(c) Ca or K;
(d) Po or At.
(a) The first noble-gas compound, prepared by Neil Bartlett in 1962, was an orange-yellow ionic solid that consisted of and . Draw a Lewis diagram for .
(b) Shortly after the preparation of the ionic compound discussed in part (a), it was found that the irradiation of mixtures of xenon and fluorine with sunlight produced white crystalline . Draw a Lewis diagram for this molecule, allowing valence expansion on the central xenon atom.
A good method of preparing pure oxygen on a small scale is the decomposition of in a vacuum above role="math" localid="1663393776109" :
Assign an oxidation number to each atom and verify that the total number of electrons lost is equal to the total number gained.
Although magnesium and the alkaline-earth metals situated below it in the periodic table form ionic chlorides, beryllium chloride () is a covalent compound.
(a) Follow the usual rules to write a Lewis diagram for in which each atom attains an octet configuration. Indicate formal charges.
(b) The Lewis diagram that results from part (a) is an extremely unlikely one because of the double bonds and formal charges it shows. By relaxing the requirement of placing an octet on the beryllium atom, show how a Lewis diagram without formal charges can be written.
Question:Ozonehas a nonzero dipole moment. In the moleculeone of the oxygen atoms is directly bonded to the other two, which are not bonded to each other.
(a) Based on this information, a state which of the following structures are possible for the ozone molecule: symmetric linear, nonsymmetric linear (for example, differentbond lengths), and bent. (Note: Even abond can have a bond dipole if the two oxygen atoms are bonded to different atoms or if only one of the oxygen atoms is bonded to a third atom.)
(b) Use the VSEPR theory to predict which of the structures of part (a) is observed.
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