What is the molarity of a solution containing 50. g of PbSO4, in 2.0 L of solution?

Which of these best describes the scientific process

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.

How do you lengthen a pattern piece? (family and consumer science, sewing)