Which of the following shows three elements in order of decreasing conductivity? - o, ge, mn -ge, o, mn -mn, ge, o -mn, o, ge

You can easily answer this if you know the periodic trends. For the property of electrical conductivity, it decreases across a period and decreases also down a group. Thus, the most conductive element must be Mn, while the least conductive one is Ge. So, the answer is: -Mn, O, Ge

The correct answer is option D which is the decreasing order of conductivity is Mn, O, Ge.

Explanation:Conductivity of an element is the ability of atoms of an element to pass energy.There are many types of conductivities like electrical conductivity, thermal conductivity etc.So this ability of atom depends actually upon the number of valence electrons in outer shell and feasibility to lose electrons.According to periodic table, conductivity of element decreases across the period and down the group.Hence the conductivity of Mn is high than O and Ge.The O is higher conductivity after that Ge.Ge is least conductive element in list.

Answer: abeexplanation:

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.

What do you need with it’s not a question your just stating what it says