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Printable Grades 6–7 chemistry worksheet with questions about atomic structure, protons, and isotopes.
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Atomic Structure and Isotopes

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This printable chemistry worksheet for Grades 6–7 has two open-response questions on atomic structure. Students analyze an oxygen atom to determine the number of protons, neutrons, and electrons, define atomic number and mass number, and explain isotopes with an example. Suitable for chemistry review, homework, or quiz preparation.

Subject:
Science
Topic:
Chemistry
Grade Level:
6th – 7th Grades
Updated June 2026

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