Oklahoma Science PH.PS1.8
ScienceGrades 9–12Matter and Its Interactions
The Standard
Develop models to support explanations of the changes in stability and composition of the nucleus of the atom and the associated energies released during the processes of fission, fusion, and radioactive decay.
Oklahoma Academic Standards for Science (2026)
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students draw before-and-after models of fission, fusion, and radioactive decay. They track protons and neutrons, show energy leaving, and explain how the nucleus becomes more stable.
What Mastery Looks Like
- Students keep proton and neutron counts correct when nuclei split, join, or emit particles. They show that beta-minus decay turns a neutron into a proton, while gamma emission leaves both counts unchanged. They connect released energy to a lower-energy nuclear state.
Common Misconceptions
- Students may think fission and fusion both split nuclei. Some treat beta-minus decay as the loss of an electron already inside the nucleus. Others think gamma emission changes the element.
How to Assess It
- Exit ticket: Draw uranium-238 emitting an alpha particle to become thorium-234. Label proton and neutron counts before and after, show energy leaving, and explain the change in stability.
Lesson moves
Ways to Teach It
Use red and blue counters to build hydrogen-2 and hydrogen-3, then rearrange them into helium-4 and a free neutron.
Ask students to use a printed binding-energy graph to explain why splitting uranium and joining hydrogen can both release energy.
Hand out isotope and decay-event cards; partners race to draw each new nucleus and check its proton and neutron counts.
Show a smoke alarm diagram and have students label the alpha particles from americium-241 that help it detect smoke.
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