Category:eo:Halogens
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Esperanto terms for types or instances of chemical elements in group 17 of the periodic table, which all have 7 valence electrons.
NOTE: This is a set category. It should contain terms for halogens, not merely terms related to halogens. It may contain more general terms (e.g. types of halogens) or more specific terms (e.g. names of specific halogens), although there may be related categories specifically for these types of terms.