Lesson 2: Atoms, Ions, Atomic Mass & Isotopes

Learning Goals:
- Students will be able to explain the relationship between atomic number and the mass number of an element (B3.1)
- Students will be able to differentiate between isotopes and radioisotopes of an element (B3.1)
Hook: To introduce the topic and refresh students prior knowledge, show them the following two videos:

Content: Interactive Lecture & Worksheets
- The following PowerPoint slideshows are examples of the lecture that can be given for the day's topic.
  - Atoms, Ions, and Isotopes: This lesson was developed by Mr. Reed, a teacher at the Bethlehem Central High School in New York. His wikispace can be found here.
  - Atoms, Ions, & Isotopes lesson:This lesson was developed by a teacher at Highland Secondary School in the Hamilton-Wentworth District School Board.
- In order for students to understand the topics fully, it is useful to have them work on practice problems. The following are examples of the type of worksheets that students can complete.
  - Isotope's & Average Atomic Mass Worksheet: This worksheet was developed by Ms. J. Bowers.
  - Isotope Problems Worksheet: This worksheet was posted on the Georgia Public Broadcasting website.
  - Average Atomic Mass Worksheet: This worksheet was developed by a teacher in the Peel District School Board.
Consolidation: To consolidate the lesson, ask students to sum up the most important points of the lesson in 5 bullet points. This can be collected and used as a formative assessment