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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>
|}