Why do electrons affect the structure of a molecule?

Explanation:

A molecule is an aggregate of atoms that are are bonded together. It is the smallest unit of a chemical compound that can take part in chemical reactions.

We know that molecules are made up of atoms. The make up of an atom consists of subatomic particles which are protons, neutrons and electrons. Protons and neutrons are located in the tiny nucleus and do not take part in chemical reactions.

For molecules to form, atoms come together. For atoms to bond, they use their valence electrons. The valence electrons occupy the outermost shell of an atom. These valence electrons are used for chemical bonding. Between molecules, bonding also occurs. The intermolecular and intramolecular bonds determines the structure of molecules. These are controlled by the valence electrons and the atoms that contains them.

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.

i think its 100

i hope this !