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Learning objective

Clarify the definitions of proton number (atomic number) Z and nucleon number (mass number) A, and demonstrate how to calculate the number of neutrons in a nucleus using A.

Read the explanation, check the common trap, then practise with flashcards and questions.

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Cambridge IGCSE PhysicsNuclear physicsCore content

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Quick explanation

Clarify the definitions of proton number (atomic number) Z and nucleon number (mass number) A, and demonstrate how to calculate the number of neutrons in a nucleus using A

  • This point belongs to The nucleus, especially The nucleus outcomes.
  • You need to be able to clarify the definitions of proton number (atomic number) Z and nucleon number (mass number) A, and demonstrate how to calculate the number of neutrons in a nucleus using A.
  • The key ideas to know are Define and Calculate.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

DefineCalculate

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This objective helps connect The nucleus outcomes to exam-style questions, flashcards, and revision notes for The nucleus.

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Paper 3 structured question: The nucleus

Paper 3Theory (Core)1 marks

Description

Atomic Structure

An atom consists of protons, neutrons, and electrons. The nucleus contains protons and neutrons, while electrons orbit around the nucleus.

  1. a

    State the definition of proton number.

    Aim for approximately 1 distinct marking point.

    [1]
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