What differentiates the isotopes of an element? A. number of protons
B. number of neutrons
C. number of electrons
D. atomic number

What is the force of attraction between the particles in a salt crystal

During chemistry class, carl performed several lab tests on two white solids. the results of three tests are seen in the data table. based on this data, carl has concluded that substance b must have bonds.

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