What is the molarity of a solution of CaCl2 if 4 liters of the solution contains 16 moles of CaCl2?

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.

What’s the percent by mass of carbon in c10h14n2

What diagram shows the ionic compound of magnesium oxide