What type of change, physical or chemical. Take place in each of the following water vapor condence to form rain

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 is the ima of the 1 st class lever in the graphic given? 2 3 0.5

Which element would mostly likely have an electron affinity measuring closest to zero