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This practice page also includes my retention tool: The BIG Box!
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This is an explanation/reteach and practice that will help a student to identify that protons determine an element's identity and valence electrons determine its chemical properties, including reactivity.
Texas Essential Knowledge and Skill (TEKS) 8.5B
This practice is also a good way to prepare a student for success on 8.5B for the 8th Grade Science STAAR.