Difference between revisions of "Neutron"
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===About Neutrons=== | ===About Neutrons=== | ||
| + | : A '''neutron''' is one of two [[baryon]]s found in the [[Atomic Nucleus|atomic nucleus]]. | ||
: '''Neutrons''' have a [[Electrical Charge|charge]] of zero and a [[mass]] of 1.67x10<sup>-27</sup>kg. | : '''Neutrons''' have a [[Electrical Charge|charge]] of zero and a [[mass]] of 1.67x10<sup>-27</sup>kg. | ||
: A '''neutron''' is only stable in the [[Atomic Nucleus|nucleus]] of an [[atom]]. However a free '''neutron''' has a mean lifeftime of around 15 minutes before it [[Radioactive Decay|decay]]s via the [[Weak Nuclear Interaction|weak interaction]] into a [[proton]] and an [[electron]]. | : A '''neutron''' is only stable in the [[Atomic Nucleus|nucleus]] of an [[atom]]. However a free '''neutron''' has a mean lifeftime of around 15 minutes before it [[Radioactive Decay|decay]]s via the [[Weak Nuclear Interaction|weak interaction]] into a [[proton]] and an [[electron]]. | ||
Revision as of 17:33, 18 July 2019
Key Stage 4
Meaning
The Neutron is a neutral particle found in the nucleus of an atom.
About Neutrons
- Neutrons are a type of nucleon.
- Neutrons have a relative atomic charge of 0 and a relative atomic mass of 1.
- The number of neutrons in an atom can be found subtracting the Atomic Number from the Relative Atomic Mass.
| Hydrogen | Helium | Lithium | Beryllium |
 |
 |
 |
 |
| This atom has an Atomic Number (Z) of 1 and a Relative Atomic Mass (A) of 1.
Number of neutrons = A - Z Number of neutrons = 1 - 1 Number of neutrons = 0 |
This atom has an Atomic Number (Z) of 2 and a Relative Atomic Mass (A) of 4.
Number of neutrons = A - Z Number of neutrons = 4 - 2 Number of neutrons = 2 |
This atom has an Atomic Number (Z) of 3 and a Relative Atomic Mass (A) of 7.
Number of neutrons = A - Z Number of neutrons = 7 - 3 Number of neutrons = 4 |
This atom has an Atomic Number (Z) of 4 and a Relative Atomic Mass (A) of 9.
Number of neutrons = A - Z Number of neutrons = 9 - 4 Number of neutrons = 5 |
Key Stage 5
Meaning
A neutron is a baryon made from 1 up-quark and 2 down-quarks.
About Neutrons
- A neutron is one of two baryons found in the atomic nucleus.
- Neutrons have a charge of zero and a mass of 1.67x10-27kg.
- A neutron is only stable in the nucleus of an atom. However a free neutron has a mean lifeftime of around 15 minutes before it decays via the weak interaction into a proton and an electron.
| Subatomic Particle | Quark-composition | Charge/e | Strangeness | Baryon Number | Lepton Number |
| \(udd\) | \(q=0\) | \(S=0\) | \(b=+1\) | \(l=0\) | |
| \(\bar{u}\bar{d}\bar{d}\) | \(q=0\) | \(S=0\) | \(b=-1\) | \(l=0\) |