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Science vocabulary worksheet for Grades 4 and 5 with terms about atomic structure: atoms, protons, electrons, neutrons, nucleus, fission, and fusion.
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Atomic Structure Vocabulary

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This printable science vocabulary worksheet for Grades 4–5 provides definitions for key terms in atomic structure, including atom, proton, electron, neutron, nucleus, fission, and fusion. Students define each term in their own words. Useful for science units on matter and energy, vocabulary review, or as a study guide before a unit assessment.

Subject:
Science
Topic:
Physics
Grade Level:
4th – 5th Grades
Updated February 2026

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