neutron
B2Academic, Scientific, Technical
Definition
Meaning
A subatomic particle found in the nucleus of every atom except hydrogen; it carries no net electric charge (is electrically neutral).
A component of atomic nuclei, crucial for nuclear stability. Its properties are fundamental to nuclear physics, chemistry, and various technologies, including nuclear power and neutron imaging. The term is also used metaphorically to describe something perceived as neutral or as a necessary, stabilizing component.
Linguistics
Semantic Notes
The word is a countable noun (neutrons). The 'neu-' prefix signifies 'neutral' (no charge). It is nearly always used in a scientific/technical context. Metaphorical use is rare but possible.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning, spelling, or usage. Pronunciations differ slightly (see IPA).
Connotations
None.
Frequency
Equally low-frequency in general discourse, but standard and frequent within scientific/technical domains in both varieties.
Vocabulary
Collocations
Grammar
Valency Patterns
[verb] + neutron: emit, capture, absorb, bombard with, consist of[adjective] + neutron: free, thermal, fast, slowVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “To go off like a neutron bomb (metaphorical, rare: to cause sudden, intense, but short-lived devastation).”
Usage
Context Usage
Business
Extremely rare. Might appear in reports on energy sector investments (e.g., 'neutron moderation in reactor design').
Academic
Core term in physics, chemistry, and engineering. Standard in textbooks and research papers on atomic structure, nuclear reactions, and astrophysics.
Everyday
Very rare. Might appear in news about nuclear energy, astronomy (neutron stars), or historical weapons.
Technical
Essential, high-frequency term. Used precisely to describe particle properties, behaviour in reactors, and detection methods.
Examples
By Part of Speech
adjective
British English
- The neutron flux was measured carefully.
- They studied neutron activation analysis.
American English
- Neutron scattering revealed the material's structure.
- The facility has a neutron beam line.
Examples
By CEFR Level
- A neutron has no electrical charge.
- Atoms are made of protons, neutrons, and electrons.
- The nucleus of a carbon atom usually contains six protons and six neutrons.
- In a nuclear reactor, neutrons split atoms to release energy.
- The stability of an isotope depends critically on the ratio of protons to neutrons in its nucleus.
- Neutron stars, the incredibly dense remnants of supernovae, are composed almost entirely of neutrons.
Learning
Memory Aids
Mnemonic
Think of the word 'neutral'. A NEUTRon has NO (ne-) electric charge - it is NEUTral.
Conceptual Metaphor
A STABILIZING FORCE (The neutron holds the nucleus together despite proton repulsion). A DENSE, INERT CORE (as in 'neutron star', metaphor for something incredibly dense and compact).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- The Russian word 'нейтрон' is a direct cognate, so no translation trap exists. Pronunciation and meaning are identical.
Common Mistakes
- Misspelling as 'nutron' or 'newtron'.
- Confusing it with 'neutrino', a different, much lighter neutral particle.
- Using it as an uncountable noun (e.g., 'The atom has neutron' instead of 'has a neutron'/'has neutrons').
Practice
Quiz
What is the primary conceptual role of a neutron in an atomic nucleus?
FAQ
Frequently Asked Questions
A neutron is a heavy particle found in the atomic nucleus. A neutrino is a very light, fundamental particle that rarely interacts with matter. They are both neutral but completely different.
Yes, as a 'free neutron', but it is unstable and decays into a proton, an electron, and an antineutrino with a half-life of about 15 minutes.
In nuclear fission, a neutron collides with a heavy nucleus (like uranium-235), causing it to become unstable and split, releasing more neutrons and a large amount of energy.
A neutron star is the incredibly dense collapsed core of a massive star after a supernova. It is so dense that protons and electrons are crushed together to form neutrons.