1. The number of electrons a single d orbital can hold is a. 10 b. 6 c. 2 d. 14 2. How many d electrons can the second energy level hold? a. 0 b. 2 c. 6 d. 10 3. The number of s electrons in a single oxygen atom is a. 0 b. 2 c. 4 d. 6 1s22s22p4

4. What is the total number of orbitals containing electrons in a nitrogen atom? a. 5 b. 3 c. 4 d. 6 5. Of the orbitals shown, the one with the lowest energy is a. 2s b. 3s c. 3d d. 2p 6. The maximum number of electrons that can occupy a 3p sublevel. a. 1 b. 2 c. 3 d. 6

7. The electron configuration of an atom is 1s22s22p63s23p3. The atomic number of the atom is a. 15 b. 11 c. 5 d. 3 8. The electron configuration of an atom is 1s22s22p63s23p6. The number of unpaired electrons in this atom are a. 2 b. 3 c. 5 d. no correct answer given 9. The electron configuration of an atom is 1s22s22p63s23p6. The number of orbitals occupied by electrons is a. 5 b. 9 c. 11 d. 15

10. The maximum number of electrons in the 4d sublevel is a. 2 b. 6 c. 8 d. 10 11. Which is the electron configuration of atomic number 18? a. 1s22s22p63s23p2 c. 1s22s22p63s23p44s2 b. 1s22s22p63s23p6 d. 1s22s22p63s23p64s2 12. The correct electron sublevel structure for 25Mn is? 1s22s22p63s63d2 b. 1s22s22p63s23p64s24p5 1s22s22p63s23p64s24p5 1s22s22p63s23p64s23d5

13. [Ar] 4s23d2 is the electron configuration for a. Scandium b. Titanium c. Vanadium d. Zirconium 14. [Kr] 5s24d10 is the electron configuration for a. Br b. I c. At d. Cd

15. Which atom does not have an unpaired electron in its ground-state electron structure? C b. Ca c. P d. Cl 2s22p2 4s2 3s23p3 3s23p5 16. Which of the waves is not part of the electromagnetic spectrum? a. X-rays b. microwaves c. sound waves d. red light

17. Regions of space around the nucleus of an atom that can be occupied by one or two electrons with identical energy are called a. shells b. energy levels c. photons d. orbitals 18. The first energy level which has f orbitals to fill is a. 2 b. 3 c. 4 d. 5 19. Members of oxygen’s family on the periodic table have electron configurations which end with a. ns2 b. ns2np1 c. ns2np2 d. ns2np4

20.Which element has the fewest energy levels? a. F b. Mg c. He d. Co Use the following spectra to answer Questions # 21 – 24 R O Y G B I V F l ll l l l llll Mg ll ll l l l l Co l l l l l l He l l l l l 20.Which element has the fewest energy levels? a. F b. Mg c. He d. Co 21. Which element has energy levels with more transitions of low energy? a. F b. Mg c. He d. Co

22. Which element has more levels in the “excited state”? Use the following spectra to answer Questions # 21 – 24 R O Y G B I V F l ll l l l llll Mg ll ll l l l l Co l l l l l l He l l l l l 22. Which element has more levels in the “excited state”? a. F b. Mg c. He d. Co 23. Which element has electrons releasing the most photons of light of medium energy? a. F b. Mg c. He d. Co

c = (wavelength)(frequency) c = 3.00 x 108 m/s 24. What is the wavelength of photons of light of frequency = 1150 kilocycles/sec? a. 26 m b. 3.4 x 1011 m c. 261 m d. 3.4 x 1014 m λ = c v = 3.00 x 108 m/s 1.15 x 106 s-1 λ = 2.61 x 102 m

c = (wavelength)(frequency) c = 3.00 x 108 m/s 25. What is the frequency ( in 1/s) of light with wavelength equal to 5 x 10-6 cm? 6 x 1015 b. 6 x 1014 c. 1.5 x1015 d. 1.5 x103 v = c λ = 3.00 x 108 m/s 5 x 10-8 m v = .6 x 1016 s-1 = 6 x 1015 s-1