1. Which one of these transitions in the Bohr hydrogen atom model leads to the emission of the photon with the longest wavelength?
ni = 1 → nf = 3
ni = 6 → nf = 5
ni = 4 → nf = 2
ni = 3 → nf = 6
ni = 5 → nf = 1

2. Dental lasers are based on neodymium yttrium aluminum garnet (Nd-YAG) crystal, with an emission wavelength of 1066 nm. What is the frequency of this laser?
2.812 × 1014 Hz
2.812 × 105 Hz
3.195 × 102 Hz
3.196 × 1018 Hz

3. The nitrogen laser emits light at 337. 1 nm
The nitrogen laser emits light at nm. What is the energy of this light?
6.696 × J
2.118 × J
5.893 × J
5.893 × J

4. Which of the following is a list of allowed quantum numbers for an electron?
n = 1, l = 1, ml = 0, ms = ½
n = 2, l = 0, ml = 1, ms = ½
n = 3, l = 0, ml = 0, ms = ½
n = 4, l = 3, ml = 4, ms = -½

5. What is the correct electron configuration for sulfur?
1s22s22p63s13p5
1s22s22p63s23p4
1s22s22p73s23p2
3s23p4

6. What is the correct condensed electronic configuration for Fe3+?
[Ar]4s23d6
[Ar]4s23d3
[Ar]3d5
[Ar]4s23d9

7. Which is the largest atom below?N Al Sr

8. Key
1. 2
2. 1
3. 4
4. 3
5. 2
6. 3
7. 4