What do you notice about the reactivity of an element and the number of valence electrons it have?

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure

Convert .347 kilometers to miles show your work