In general, what is the effect of tempature on the solubility of a gas

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.

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

Electric charge is what ? a. kinetic energy b. radiation c. discovery d. electricity