What is the total number of electrons in an atom of potassium?
(1) 18 (3) 20
(2) 19 (4) 39

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

Achemist has dissolved a certain substance in water. the chemist knows that more of the substance could be dissolved into the water before it stops dissolving. therefore

Draw two cyclic constitutional isomers of cis-1