The geometry is called pentagonal bipyramidal. This has a lot of similarities to a 6-coordinate molecule except there are 5 domains in one plane. Predict the following based on this information: a. Draw the structure of a molecule with 7 bonding domains
b. List all the bond angles possible between adjacent atoms
c. Predict the electron and molecule geometry for a molecule with 6 bonding domains and a single lone pair
d. Predict the electron and molecule geometry for a molecule with 5 bonding domains and two lone pairs

Solution :

A pentagonal bipyramidal is a bond structure where the bond angle that surrounds an atom is not identical. Different bond angles are different. It has one central atom having seven ligands at the corners of the pentagonal bipyramidal.

a). The shape of the molecule that have 7 bonding domains is called the pentagonal bipyramidal. For example take the case of .

The structure of the molecule is attached below.

b). The bond angles that can be possible between all the adjacent atoms are 72 degrees and 90 degrees.

c). The lone pair is represented by E and the 6 bonding domains, the geometry is the pentagonal pyramidal, that is in the case of .

d). With two lone pairs, which is represented by E and as many as 5 bonding domains, the geometry is described as pentagonal planar. For example,

1. the question asks the most appropriate, which seems to rule out "all of the above." your choice appears to be the correct one.

2. the protocol described is good for identifying correlation, but not cause and effect. for cause/effect, you need to devise a protocol that will assign the treatment (or not) to groups that have essentially the same "demographics" with respect to all the other variables. your choice regarding control group seems appropriate. random assignment of treatment (choice d) may be appropriate also. (i think you can argue that b and d are just different descriptions of the same method.)

3. d will randomize the birds, but may not guarantee there are 10 in each group. e will do both, so seems the better choice.

comment on question 2

based on the problem statement, it seems clear that confident, attentive drivers are more likely to use daytime running lights. so, the protocol might need to be devised in such a way that the lights would be turned on or off without the driver's knowledge. (an attentive driver will figure it out.) assigning a confident, attentive driver to a group required to drive without running lights might mess with his/her confidence and attentiveness. you don't want your experiment to do that. (nor do you want the experiment to subject a driver to greater risk of accident as a consequence of driving without running lights.) experiments involving human safety are always problematic.

the answer is c.the valence of the atoms combine .