1. A radioactive transuranic element
   - hassium, Hs, element 108

Type of: chemical element, element

• family Ceratostomataceae
• family Cercidiphyllaceae
• family Cercopidae
• family Cercopithecidae
• family Certhiidae
• family Cervidae
• family Cestidae
• family Cetorhinidae
• family Chaetodontidae
• family Chalcidae
• family Chalcididae
• family Chamaeleonidae
• family Chamaeleontidae
• family Characeae
• family Characidae
• family Characinidae
• family Charadriidae
• family Chelonidae
• family Cheloniidae
• family Chelydridae
• family Chenopodiaceae
• family Chermidae
• family Chimaeridae
• family Chinchillidae
• family Chironomidae