In an electrically neutral atom, the number of A. protons equals the number of neutrons.

B. protons equals the number of electrons.

C. neutrons equals the number of electrons.

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.

According to le chatelier’s principle, a system in chemical equilibrium responds to stress by shifting the equilibrium in a direction that reduces the stress. normalizes the stress. increases the stress. changes the stress.

Ab c or d ? i’m not sure what the answer is