The Chemistry Book

Lesson Title: Electron Configurations
Textbook page: Pages 365-67
Chemistry Passport: Page 68 Objectives 1.Students will be able to identify the arrangement of electrons in the atom according to the valence electrons.

Lesson Content

Electron Configurations are the arrangement of electrons within the electron cloud of an atom. The electron configurations can be represented with numbers and letters. They are also in diagrams showing the distribution of the electrons throughout the orbitals and energy levels.

Electrons are arranged in orbital and energy levels. The number of sublevels equals the quantum number of that level. For example: 2nd energy level has 2 sublevels, s and p.

Diagram

Example Problems (Minimum of 5 problems with answers in red)
1. What is the electron configuration of fluorine? 1s22s22p5, because it has 9 electrons.
2. What is the electron configuration of neon? 1s22s22p6, because there are 10 electrons.
3. How many valence electrons are there in oxygen? Six, because it is in group 6a.
4. What is the electron configuration of nitrogen? 1s22s22p3 because there are a total of seven electrons.
5. many valence electrons are in carbon? Four valence electrons, because it is in group 4a.

References