Answer:
Sorry it is so blur how can l answer
2, 8,6 because it has to be in a configuration of 2,8,8
Answer: It is important to wet the filter paper in the Buchner funnel first with cold re crystallization solvent before the re crystallization mixture being filtered to minimize gaps around the edges of the filter paper which can prevent mechanical impurities from passing through. This gives better filtration where most impurities can be filtered. Furthermore, it provides good vacuum.
O2 gas, where there are two Oxygen atoms which are covalently bonded together
