1. Calculate the de Broglie wavelength (in nm) of an electron moving at 1.25 x 105 m/s.
h=6.626 x 10–34 J·s
me=9.109 x 10–31 kg
2. Which set of quantum numbers below could belong to an electron in a 4d orbital?
| n | l | ml | |
| A | 4 | 0 | 0 |
| B | 4 | 1 | –1 |
| C | 4 | 1 | 2 |
| D | 4 | 2 | –1 |
| E | 4 | 2 | 3 |
3. What is the maximum number of orbitals in an atom that can have n=5 and l=3?
Please help with these 3 questions! Thank you