ChalkHour

Year 9 Chemistry: Atomic structure lesson pack

A complete, ready-to-teach KS3 lesson on atomic structure. Below is a real sample of what ChalkHour makes: the full pack adds three levels of worksheet, model answers, a teaching explainer and print-ready PDF and Word files.

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Real sample

Atomic Structure: The Building Blocks of Matter

This lesson introduces students to the internal structure of the atom. It covers the properties of protons, neutrons, and electrons, how to navigate the Periodic Table to find atomic data, and introduces the concept of isotopes.

Learning objectives

  • Identify the three subatomic particles and state their relative charges and masses.
  • Calculate the number of protons, neutrons, and electrons using atomic and mass numbers.
  • Describe the distribution of mass and charge within an atom.
  • Explain the concept of isotopes and how they differ from standard atoms.

Lesson plan (60 minutes)

  1. Introduction · 5 min

    Starter: Retrieval practice on elements and compounds. Identify symbols from the Periodic Table.

  2. Teaching · 10 min

    Teacher-led explanation of subatomic particles, their properties, and location.

  3. Modelling · 10 min

    Worked example: Calculating subatomic particles using Atomic Number and Mass Number.

  4. Independent Practice · 20 min

    Differentiated worksheet practice (Support, Core, Stretch).

  5. Feedback · 5 min

    Peer marking using the answer key.

  6. Plenary · 10 min

    8-question multiple-choice quiz to check understanding.

Key vocabulary

Nucleus
The tiny, dense centre of an atom containing protons and neutrons.
Proton
A positively charged subatomic particle found in the nucleus.
Neutron
A neutral subatomic particle found in the nucleus with a relative mass of 1.
Electron
A negatively charged subatomic particle that orbits the nucleus.
Atomic Number
The number of protons in the nucleus of an atom.

Core worksheet (first questions)

  1. A Carbon atom has an atomic number of 6 and a mass number of 12. State the number of protons, neutrons, and electrons.
  2. Define 'Atomic Number'.
  3. Define 'Mass Number'.
  4. Explain why atoms have no overall electrical charge.

Quiz (sample)

  1. 1. Where is the majority of the mass of an atom located?

    • A. Shells
    • B. Nucleus
    • C. Orbitals
    • D. Vacuole

  2. 2. What is the relative charge of a proton?

    • A. -1
    • B. 0
    • C. +1
    • D. +2

  3. 3. Which subatomic particle has a relative mass of 1 but no charge?

    • A. Proton
    • B. Electron
    • C. Neutron
    • D. Nucleus

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Support and Stretch worksheets, every answer and model answer, the teaching explainer and common misconceptions, editable and ready to print as PDF or Word.

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