Atoms with the same number of protons but different numbers of neutrons are

1) different elements
2) isotopes of the same element
3) isotopes of different elements
4) ions

The slope of a velocity time graph over any interval of time gives the during that interval

The experiment was repeated many years later but the gases were mixed in a different type of container. a white solid was obtained which was xenon fluoride. predict whether you think 1) krypton and 2) radon will react with fluorine. explain reasons for your predictions

Arowboat passenger uses an oar to push the boat off the dock by exerting a force of 40n for 3.0s. what impulse acts on the boat.