actinoid atom mendelevium atom 0 101Md 258.00000 258.00000 CAS:7440-11-1 CHEBI:33395 InChI=1S/Md MQVSLOYRCXQRPM-UHFFFAOYSA-N Md Md Unu WebElements:Md [Md] chebi_ontology mendelevium mendelevium unnilunium mendélévium 钔 Mendelevium Mendelevium mendelevio mendelevio mendelevio f-block element atom