Give the symbol for the cation possessing a positive two charge that is isoelectronic with neon.

Explanation:

Magnesium is the element of group 2 and third period. The atomic number of Magnesium is 12 and the symbol of the element is Mg.

The electronic configuration of the element Magnesium is:-

Noble gas notation includes a shorthand way of writing the electronic configuration of the elements.

The nearest noble gas - Neon which has electronic configuration of -

So, the noble gas notation for Magnesium is:-

Thus, Magnesium losing 2 electrons will be isoelectronic with neon and has configuration of .

Thus, the symbol of the cation is:-

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.

answerto predict;