1. $$$ Quiz $$$ Electrons

2. Who solved the photoelectric effect problem? Einstein

3. Can a electron be considered a wave and a particle? Who stated this? Yes, DeBroglie

4. What is the photelectric effect? When light shines on a metal, and only ejects electrons at a threshhold wavelength (or frequency)

5. What is Hund’s rule? Electrons fill up orbitals at same energy level one at a time, before doubling up

6. What does the Pauli Exclusion principle state? Only two electrons per orbital and they must have opposite spins

7. According to the Aufbau principle, how do electrons enter orbitals? In the lowest energy orbitals first (ie. 1s, then 2s, etc.)

8. What does the Heisenberg Uncertainty principle have to say about electrons? You can’t know the position and velocity (speed and direction) of an electron at the same time

9. Which element has the electron configuration 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 3 ? Arsenic, As

10. Can you name a 5A anion (group 15) that has the following electron configuration 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 ? Arsenide, As 3-

11. What happens when an electron goes from an excited state back down to its ground state? A characteristic color is emitted depending on the atom

12. Name the diatomic elements. hydrogen - have nitrogen – no fluorine - fear oxygen - of iodine - ice chlorine - cold bromine - beer

13. Who is mostly responsible for developing the quantum mechanical model of the atom? Erwin Schrodinger

14. What are the letter symbols for the four orbitals? s,p,d,f

15. What are the maximum number of orbitals in the s,p,d & f sublevels? 1,3,5,7

16. What are the maximum number of electrons in the s,p,d & f sublevels? 2,6,10,14

17. Wavelength ( ) = ? c/ (Do you know the units for these three numbers?)

18. Energy = ? h x (Do you know the units for these three numbers?)

19. What is a photon? An elementary particle that carries a quantum of light and all other forms of electromagnetic radiation

20. Which has a larger frequency, gamma rays or radio waves? gamma rays

21. Which has a larger wavelength, gamma rays or radio waves? radio waves

22. Which has more energy, gamma rays or radio waves? gamma rays