How much does one gallon of salt water weigh?

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.

List four observations that indicate that a chemical reaction may be taking place

Why does asexual reproduction result in offspring with identicle genetic variation