Learning objective
Define mass number as the total number of protons and neutrons in an atom.
Read the explanation, check the common trap, then practise with flashcards and questions.
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Topic
A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes
Subtopic
Size and mass of atoms
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Quick explanation
Define mass number as the total number of protons and neutrons in an atom
- This point belongs to A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes, especially Size and mass of atoms.
- You need to be able to define mass number as the total number of protons and neutrons in 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
Why it matters
This objective helps connect Size and mass of atoms to exam-style questions, flashcards, and revision notes for A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes.
Quick student answer
What is mass number?
Direct answer
In Chemistry, this page helps you answer questions about mass number within A simple model of the atom, symbols, relative atomic mass, electronic charge 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 protons.
Key terms
- mass number: The total number of protons and neutrons in an atom. In Size and mass of atoms, this term helps explain define mass number as the total number of protons and neutrons in an atom for AQA GCSE Chemistry 8462.
- protons: Positively charged subatomic particles found in the nucleus of an atom. In Size and mass of atoms, this term helps explain define mass number as the total number of protons and neutrons in an atom for AQA GCSE Chemistry 8462.
Common trap
Confusing Mass Number with Atomic Number: Remember that mass number is the total of protons and neutrons, while atomic number is just the number of protons.
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Revision notestopic notes
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Open revision notesRelated learning objectives
- Define an atom as the smallest part of an element that can exist.
Atoms, elements and compounds
- Explain that each element is represented by a chemical symbol, using examples such as O for oxygen and Na for sodium.
Atoms, elements and compounds
- Describe elements as substances made from one type of atom and shown in the periodic table.
Atoms, elements and compounds
- Describe compounds as substances made from two or more elements chemically combined in fixed proportions.
Atoms, elements and compounds
- Explain that compounds can only be separated into elements by chemical reactions.
Atoms, elements and compounds