Who is a boy and 16 ?

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.

Under normal conditions, describe how increasing the temperatures effects the solubility of a typical salt

Draw the aromatic compound toluene (methylbenzene). show all hydrogen atoms, including those on the ring.