Density = 12 g/mL and the Volume = 4 mL. What is the mass?

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 best describes how johannes kepler developed his laws of planetary motion

How heavy is thanos? a) 3000 lbs b) all of it c) the price of tea in china d) heavy enough