How many grams of KCl is needed to prepare 50.0 mL of a 0.10 M solution

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.

In which phase(s) do the molecules take the shape of the container?

What term describes technology that operates on an atomic level