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The Nature of Matter · Term 1

Subatomic Particles and Isotopes

Understanding protons, neutrons, electrons, and the concept of isotopes.

Key Questions

  1. Explain how the number of protons defines an element.
  2. Compare the properties of different isotopes of the same element.
  3. Analyze the role of neutrons in atomic stability and radioactive decay.

Ontario Curriculum Expectations

HS-PS1-1
Grade: Grade 9
Subject: Science
Unit: The Nature of Matter
Period: Term 1

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