2. What is the electron dot diagram for the element silicon?

3. What is the correct number of valence electrons in the element gallium?

4. What is the frequency of the wave shown?

5. Which is the frequency of the wave shown?

6. What is the amount of energy carried by a photon that has a frequency of 5.71 × 1014 Hz?

7. Which is the most probable location for an electron in this orbital?

8. Which of these elements has 5 valence electrons?
a. boron (B) b. rubidium (Rb)
c. vanadium (V) d. arsenic (As)

9. What is the electron configuration for the element molybdenum (Mo)?

10. Which diagram shows a wave with the highest frequency?

11. What is the frequency of a light wave with a wavelength of 680 nm
What is the frequency of a light wave with a wavelength of 680 nm? (1 m = 1 x 109 nm)

12. A photon is emitted from an atom with an energy of 4. 25 × 10-19 J
A photon is emitted from an atom with an energy of 4.25 × J. What is the wavelength of the photon?

13. Which element has the electron configuration 1s22s22p63s23p64s23d5?

14. What element has 15 protons and 15 electrons
What element has 15 protons and 15 electrons? Write the electron configuration and orbital diagram for this element.

15. What is Hund's rule?

16. Explain the Aufbau principle.

17. State the Pauli exclusion principle.

18. What is the ground state electron configuration of antimony and the number of valence electrons in it?

19. Write the noble gas form of the electron configuration and the electron dot structure of strontium and zinc.

20. Write the electron configuration of the following:
(a) selenium
(b) silver
(c) tungsten
(d) lithium

21. Write the noble gas form of the electron configuration and the electron dot structure of bismuth and nickel.