Pls help due tonight
or my dad will get mad at me

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 much energy is made when a pice of wood burns. how do you know

Which of the following electromagnetic waves can create ions?