Question 1
Learning objective
Define mass number as the total number of protons and neutrons in the nucleus of an atom.
Read the explanation, check the common trap, then practise with flashcards and questions.
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Topic
Atoms and isotopes
Subtopic
Mass number, atomic number and isotopes
Aqa Gcse PhysicsAtomic structure
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Quick explanation
Define mass number as the total number of protons and neutrons in the nucleus of an atom
- This point belongs to Atoms and isotopes, especially Mass number, atomic number and isotopes.
- You need to be able to define mass number as the total number of protons and neutrons in the nucleus of an atom.
- The key ideas to know are mass number.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
Key concepts
mass number
Why it matters
This objective helps connect Mass number, atomic number and isotopes to exam-style questions, flashcards, and revision notes for Atoms and isotopes.
Quick student answer
What is mass number?
Direct answer
In Physics, this page helps you answer questions about mass number within Atoms and isotopes. Focus on the key process, correct scientific terms, and how the idea links to exam-style questions. Key terms to check are mass number and atomic number.
Key terms
- mass number: The total number of protons and neutrons in the nucleus of an atom.
- atomic number: The number of protons in the nucleus of an atom, which determines the element.
Common trap
Confusing Mass Number and Atomic Number: Remember that the mass number is the total number of protons and neutrons in the nucleus, while the atomic number is only the number of protons.
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Open revision notesRelated learning objectives
- Describe atoms as very small particles with a radius of about 1 x 10^-10 metres.
The structure of an atom
- Describe the nucleus as the small central part of an atom.
The structure of an atom
- State that the nucleus contains protons and neutrons.
The structure of an atom
- State that nearly all the mass of an atom is concentrated in the nucleus.
The structure of an atom
- Describe electrons as negatively charged particles arranged in shells or energy levels around the nucleus.
The structure of an atom