Unclassified
Quarkonium
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Unclassified
Quarkonium
Meson whose constituents are a quark and its own antiquark of the same flavor
epic · Q1540413
Related cards · composite particle
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Unclassified
Atom
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Unclassified
Hydrogen atom
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Unclassified
Positronium
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Unclassified
Exotic atom
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.svg/330px-Helium_atom_(not_to_scale).svg.png)
Unclassified
Helium atom
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Hydrogen-like atom
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Unclassified
Subatomic particle
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Unclassified
Weakly interacting massive particle
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Unclassified
Strangelet
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Unclassified
Preon
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Unclassified
Mirror matter
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Concepts
Superfluid helium-4
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Iconic places
Afghanistan
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Austria
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Meta topics
Alaska
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Iconic places
Bahrain
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Iconic places
Athens
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Iconic places
Aruba
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