Which of the following statements is TRUE?
A) The emission spectrum of a particular element is always the same and can be used to identify the element.
B) Part of the Bohr model proposed that electrons in the hydrogen atom are located in "stationary states" or particular orbits around the nucleus.
C) The uncertainty principle states that we can never know both the exact location and speed of an electron.
D) An orbital is the volume in which we are most likely to find an electron.
E) All of the above are true.
Answer: E