The EPA has used the slogan “Ozone: good up high, bad nearby” in some of its publications for the general public. Explain the message

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 would be caused by a chemical change? a) the formation of lava. b) sedimantary rock layering over time. c) metamorphic rock forming from igneous. d) metamorphic rock eroding to form sedimentary rock.

The atomic number, or number, is the described as the number of in the nucleus of an chemical element.