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==Key Stage 5==
===Meaning===
===About Down-quarks===
: The '''down-quark''' is denoted with a lower case '''d'''.
: There are two '''down-quarks''' in a [[neutron]] and only one '''down-quark''' in a [[proton]].
{| border="1" style="border-collapse:collapse"
| style="height:20px; width:120px; text-align:center;"|'''[[Quark]]'''
| style="height:20px; width:120px; text-align:center;"|[[Electrical Charge|'''Charge''']]/[[Elementary Charge|e]]
| style="height:20px; width:120px; text-align:center;"|
[[Down-quark]]
| style="height:20px; width:120px; text-align:center;"|<math>qQ=-\frac{1}{3}</math>
| style="height:20px; width:120px; text-align:center;"|<math>S=0</math>
| style="height:20px; width:120px; text-align:center;"|<math>bB=+\frac{1}{3}</math>| style="height:20px; width:120px; text-align:center;"|<math>lL=0</math>
|-
| style="height:20px; width:120px; text-align:center;"|
[[Antidown-quark]]
| style="height:20px; width:120px; text-align:center;"|<math>qQ=+\frac{1}{3}</math>
| style="height:20px; width:120px; text-align:center;"|<math>S=0</math>
| style="height:20px; width:120px; text-align:center;"|<math>bB=-\frac{1}{3}</math>| style="height:20px; width:120px; text-align:center;"|<math>lL=0</math>
|}