Aneutron inside the nucleus of an atom breaks down into a and an which is emitted

Oxidation state of iron in mohrs salt

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 mass of 4 molecules of co2