A student wants to calculate the force between a charged balloon and the wall it is stuck to. Which variables would the student need to know to calculate this force?

Which statement is the best definition of an atom? a) anything that has mass and occupies space. b) the smallest particle that has the properties of an element. c) a substance that cannot be broken down chemically into simpler substances. eliminate d) the smallest unit of a substance that exhibits all of the properties characteristic of that substance.