A sample of solid tungsten is heated with an electrical coil. If 27.2 Joules of energy are added to a 12.4 gram sample initially at 20.2°C, what is the final temperature of the tungsten?

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

Which of these conditions most likely produces an unstable isotope?

Water is initially present in a state where its molecules are far apart. during a change of state, its molecules slow down. which change of state has most likely taken place? from a gas to a liquid from a liquid to a gas from a solid to a liquid from a gas to a plasma