Structure of Atom

Topics in this chapter

• Bohr Model and Atomic Energy
• Hydrogen Spectra and Transitions
• Quantum Numbers and Electron Configuration
• Orbitals and Atomic Nodes
• Matter Waves and de Broglie Relations
• Heisenberg Uncertainty Principle
• Photoelectric Effect and Work Function

Cheat sheet

Practice questions

1. Question 1Q-7C9CC2

   Which of the following sets of quantum numbers is not permissible?

   1. A.n = 3, l = 2, m = -2, s = +1/2
   2. B.n = 2, l = 1, m = 0, s = -1/2
   3. C.n = 1, l = 0, m = 0, s = +1/2
   4. D.n = 3, l = 3, m = -3, s = +1/2
   See the answer and solution
2. Question 2Q-E72270

   The energy of an electron in the second Bohr orbit of the hydrogen atom is $-3.4 \text{ eV}$. What is the energy of the electron in the third Bohr orbit?

   1. A.-1.51 eV
   2. B.-0.85 eV
   3. C.-2.27 eV
   4. D.-3.40 eV
   See the answer and solution
3. Question 3Q-A4598F

   Calculate the wavelength (in nm) associated with a moving electron of mass $9.1 \times 10^{-31} \text{ kg}$ having a velocity of $3.0 \times 10^6 \text{ m s}^{-1}$. (Planck's constant $h = 6.626 \times 10^{-34} \text{ J s}$)

   1. A.2.42 nm
   2. B.0.242 nm
   3. C.24.2 nm
   4. D.0.024 nm
   See the answer and solution
4. Question 4Q-1EEC9F

   The total number of orbitals associated with the principal quantum number $n = 4$ is:

   1. A.4
   2. B.8
   3. C.16
   4. D.32
   See the answer and solution
5. Question 5Q-17F898

   The correct set of four quantum numbers for the outermost electron of a Sodium atom (atomic number 11) is:

   1. A.3, 0, 0, +1/2
   2. B.3, 1, 0, +1/2
   3. C.3, 0, 1, +1/2
   4. D.2, 0, 0, +1/2
   See the answer and solution