Answer:
An impurity is something that ruins the uncontaminated nature of something. If someone accuses you of impurity, they think you or your nature has been spoiled in some way by sin. When water is pure, the only thing in that water is water.
Answer:
I think it would be b. The octet rule states that transition metal group elements tend to react so that they attain a noble gas electron configuration.
I believe bar C would be Mercury and bar B would be jupiter. I'm not to sure on this it could be wrong, it would help if i could see the graph but anyway i hope this helps you. :)
the significant figures is 5 and decimals is 6