11 Asa Chemistry Atomicstructure Lessonplan

Instructional Objectives

(a) identify and describe protons, neutrons and electrons in terms of their relative charges and relative masses
(b) deduce the behaviour of beams of protons, neutrons and electrons in electric fields
(c) describe the distribution of mass and charges within an atom
(d) deduce the numbers of protons, neutrons and electrons present in both atoms and ions given proton and nucleon numbers (and charge)
(e) (i) describe the contribution of protons and neutrons to atomic nuclei in terms of proton number and nucleon number
(ii) distinguish between isotopes on the basis of different numbers of neutrons present
(iii) recognise and use the symbolism xAyfor isotopes, where x is a the nucleon number and y is the proton number
(f) describe the number and relative energies of the s, p and d orbitals for the principal quantum numbers 1, 2 and 3 and also the 4s and 4p orbitals.
(g) describe the shapes of s and p orbitals and d orbitals
(h) state the electronic configuration of atoms and ions given the proton number (and charge), using the convention 1s2, 2s2, 2p6 etc
(i) explain and use the terms ionisation energy and electron affinity
(ii) explain the factors influencing the ionisation energies of elements
(iii) explain the trends in ionisation energies across a Period and down a Group of the Periodic Table
(j) deduce the electronic configurations of elements from successive ionisation energy data
(k) interpret successive ionisation energy data of an element in terms of the position of that element within the Periodic Table

Teaching process

  • All the concepts in this topic are related to atoms which are at microscopic levels. Hence imagination and interpretation of the data plays a important role the understanding the above concepts. The teaching process stresses the importance of the skills mentioned.

Suggested reading

  • JJ thomson experiment


  • Periodic trends with explanation


  • Exceptions in electronic configuration


  • Raymond Chang - Chapter 2 - Full
  • Raymond Chang - Chapter 7 - Atomic orbitals (Pg 288) till the end except for quantum numbers
  • Raymond Chang -Chapter 8 - Full


  • Experiments involving titration are continued once the required material arrives.


  • End of chapter questions
  • Extended questions (If needed)
Unless otherwise stated, the content of this page is licensed under Creative Commons Attribution-ShareAlike 3.0 License