Difference between revisions of "Neutron"
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Number of [[neutron]]s = 5 | Number of [[neutron]]s = 5 | ||
| + | |} | ||
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| + | ==Key Stage 5== | ||
| + | ===Meaning=== | ||
| + | A '''neutron''' is a [[baryon]] made from 1 [[up-quark]] and 2 [[down-quark]]s. | ||
| + | |||
| + | ===About Neutrons=== | ||
| + | : '''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]]. | ||
| + | |||
| + | {| border="1" style="border-collapse:collapse" | ||
| + | | style="height:20px; width:120px; text-align:center;"|'''[[Subatomic Particle]]''' | ||
| + | | style="height:20px; width:120px; text-align:center;"|[[Electrical Charge|'''Charge''']]/[[Elementary Charge|e]] | ||
| + | | style="height:20px; width:120px; text-align:center;"|'''[[Strangeness]]''' | ||
| + | | style="height:20px; width:120px; text-align:center;"|'''[[Conservation of Baryon Number|Baryon Number]]''' | ||
| + | | style="height:20px; width:120px; text-align:center;"|'''[[Conservation of Lepton Number|Lepton Number]]''' | ||
| + | |- | ||
| + | | style="height:20px; width:120px; text-align:center;"| | ||
| + | [[Proton]] | ||
| + | | style="height:20px; width:120px; text-align:center;"|<math>q=0</math> | ||
| + | | style="height:20px; width:120px; text-align:center;"|<math>S=0</math> | ||
| + | | style="height:20px; width:120px; text-align:center;"|<math>b=+1</math> | ||
| + | | style="height:20px; width:120px; text-align:center;"|<math>l=0</math> | ||
| + | |- | ||
| + | | style="height:20px; width:120px; text-align:center;"| | ||
| + | [[Antiproton]] | ||
| + | | style="height:20px; width:120px; text-align:center;"|<math>q=0</math> | ||
| + | | style="height:20px; width:120px; text-align:center;"|<math>S=0</math> | ||
| + | | style="height:20px; width:120px; text-align:center;"|<math>b=-1</math> | ||
| + | | style="height:20px; width:120px; text-align:center;"|<math>l=0</math> | ||
|} | |} | ||
Revision as of 17:26, 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
- 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 | Charge/e | Strangeness | Baryon Number | Lepton Number |
| \(q=0\) | \(S=0\) | \(b=+1\) | \(l=0\) | |
| \(q=0\) | \(S=0\) | \(b=-1\) | \(l=0\) |