protaktīnijs

== Latvian == === Etymology === From proto- (“first”) +‎ actinium. === Pronunciation === === Noun === protaktīnijs m (1st declension) protactinium (metallic chemical element, with atomic number 91.) protaktīnija izotopi ― protactinium isotope protaktīnijs ir sudrabbalts, radioaktīvs metāls ― protactinium is a silvery white, radioactive metal ==== Declension ====