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Atomic structure practice
This 9th grade practice activity on atomic structure helps students identify and understand protons, neutrons, electrons, atomic and mass numbers, isotopes, and ions through question types like multiple-choice, ordering, and fill-in-the-blank exercises.
By Edform · Chemistry · Grade 9 · Published Oct 15, 2026 · New
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Questions
- Which subatomic particle determines the atomic number of an element?
- Which of the following statements about isotopes are correct?
- Arrange the following subatomic particles in order of increasing mass.
- Fill in the blanks with the correct numbers: A neutral atom of carbon has _ protons, _ neutrons, and ___ electrons.
- Select the correct option for each blank: The atomic number is the number of _ in an atom, while the mass number is the sum of _.
- What is the charge of an ion with 11 protons and 10 electrons?
- Calculate the number of neutrons in an atom of phosphorus-31 (atomic number 15).
- Match each term to its correct definition.
- Sort the following particles and terms into the correct categories.
- Decide if each statement about atomic structure is true or false.
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