This worksheet explains how isotopes can become unstable and investigates the number of protons and neutrons in example isotopes. Students then use the ANSTO Atom Builder online to construct isotopes and record if they are stable or unstable. The Australian Nuclear Science and Technology Organisation is acknowledged for creating and proving access to the Atom Builder App.

Educational Value Statement

• Introduces radioactive isotopes
• Demonstrates number of protons and neutrons in isotopes
• Links number of protons and neutrons to isotope stability
• Can be downloaded as a PDF File

Key Learning Objectives

• Students can explain how unstable isotopes are formed
• Students identify the number of protons and neutrons in isotopes
• Students can determine if an isotope is stable or unstable

Strands

Science Understanding : Chemical Science

Australian Curriculum Content Statements

Science:  (ACSSU177)