Which of the following is not a velocity?* 25 m/s south
100 km/s east
O 50 mph
10 ft/s up
O

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.