Which statement about the neutrons that make up an element is true?
a. they have no mass.
b. they orbit the nucleus.
c. they have no electrical charge.
d. they determine what the element is.

For each of the following types of reactions, write a general reaction formula in the symbolic form—for example, a + b → ab. single-displacement double-displacement synthesis decomposition

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

Why are people not able to skip a dive to the deepest part of the ocean