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ha

   Also found in: Dictionary/thesaurus, Medical, Financial, Acronyms, Wikipedia 0.01 sec.
Ha, formerly the suggested symbol for the name hahnium, which was applied variously to two elements, now called dubnium dubnium , artificially produced radioactive chemical element; symbol Db; at. no. 105; mass number of most stable isotope 262; m.p., b.p., and sp. gr. unknown; valence +5.
..... Click the link for more information.  and hassium hassium , artificially produced radioactive chemical element; symbol Hs; at. no. 108; mass number of most stable isotope 265; m.p., b.p., sp. gr., and valence unknown.
..... Click the link for more information. .
ha
(mechanics)
hectare
Ha
(chemistry)
hahnium


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