What is formed when the number of electrons does not equal the number of protons. a). atom b). isotope c). ion

What property is a characteristic of a substance that can be observed and does not change the identity of the substance

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?

Road users moving into your lane, brake lights, and abrupt changes in road surface are a. rare at night b. indicators of potential hazards c. not worth worrying about before you reach them d. no problem for experienced drivers