Learning objective
Explain that alpha decay decreases mass number by 4 and atomic number by 2.
Read the explanation, check the common trap, then practise with flashcards and questions.
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Topic
Atoms and nuclear radiation
Subtopic
Nuclear equations
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Quick explanation
Explain that alpha decay decreases mass number by 4 and atomic number by 2
- This point belongs to Atoms and nuclear radiation, especially Nuclear equations.
- You need to be able to explain that alpha decay decreases mass number by 4 and atomic number by 2.
- The key ideas to know are mass number, alpha decay, and atomic 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 Nuclear equations to exam-style questions, flashcards, and revision notes for Atoms and nuclear radiation.
Quick student answer
How do you explain alpha decay decreases mass number by 4 and atomic number by 2?
Direct answer
In Physics, this page helps you answer questions about alpha decay decreases mass number by 4 and atomic number by 2 within Atoms and nuclear radiation. Focus on the key process, correct scientific terms, and how the idea links to exam-style questions. Key terms to check are alpha decay and mass number.
Key terms
- alpha decay: A type of radioactive decay in which an unstable nucleus emits an alpha particle, resulting in a decrease of mass number by 4 and atomic number by 2.
- mass number: The total number of protons and neutrons in the nucleus of an atom, which determines the isotope of an element.
Common trap
Common Mistake in Alpha Decay Explanation: Remember that alpha decay decreases the mass number by 4 and the atomic number by 2. Use the correct values when explaining the changes in the nucleus.
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Revision notestopic notes
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Open revision notesRelated learning objectives
- Define radioactive decay as the process in which an unstable nucleus emits radiation.
Radioactive decay and nuclear radiation
- State that radioactive decay is a random process.
Radioactive decay and nuclear radiation
- Explain that radioactive decay changes the nucleus of an atom.
Radioactive decay and nuclear radiation
- Describe alpha radiation as a helium nucleus containing two protons and two neutrons.
Radioactive decay and nuclear radiation
- Describe beta radiation as a high-speed electron emitted from the nucleus.
Radioactive decay and nuclear radiation