What is the the net force on a skydiver falling with a constant velocity of 20 m/s
downard.

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 forms when chemical reactions combine pollution with sunlight?

Hey guys so i need to know what is _nh3+> nh4oh ~chemistry~