Answer:
Chlorine
Explanation:
Chlorine has an atomic number of 17 and a configuration of 2, 8, 7. In the outermost shell, it has 7 seven electrons which means that it needs just one more electron to attain an octet configuration in that shell. Therefore it's can react quickly with any nearby nucleophile.
Yes MgF2 is a pure substance
This question is very vague but I see that you posted it in Chemistry.
We can then assume that a chemical reaction is occurring that most be breaking down the building, an example being rust or corrosion. This would be environmental damage.
However, a building can be considered both a part of society and the environment depending on how you look at it. Also, it can both have environmental and social impact if its being broken down.
