Structure of the Atom

Topics in this chapter

• Discovery of Subatomic Particles
• Atomic Models and Structure
• Electronic Configuration and Shells
• Atomic Number and Mass Number
• Isotopes, Isobars, and Atomic Mass
• Valency, Ions, and Atomic Stability

Cheat sheet

Practice questions

1. Question 1Q-C4A757

   Which of the following subatomic particles was discovered by J.J. Thomson through the cathode ray discharge tube experiment?

   1. A.Proton
   2. B.Electron
   3. C.Neutron
   4. D.Alpha particle
   See the answer and solution
2. Question 2Q-41C709

   What was the main drawback of Rutherford's model of the atom?

   See the answer and solution
3. Question 3Q-66AC6A

   Which of the following scientists proposed that electrons revolve in discrete orbits called energy levels without radiating energy?

   1. A.J.J. Thomson
   2. B.Ernest Rutherford
   3. C.Neils Bohr
   4. D.James Chadwick
   See the answer and solution
4. Question 4Q-927388

   The maximum number of electrons that can be accommodated in a shell is given by the formula $2n^2$, where $n$ is the orbit number. What is the maximum capacity of the M-shell (third shell)?

   1. A.2
   2. B.8
   3. C.18
   4. D.32
   See the answer and solution
5. Question 5Q-5FC610

   Define valency. What is the valency of an element with atomic number 16?

   See the answer and solution