Plutonium and Nobelium

Plutonium is the homologue of Samarium in the lanthanide series, which was translated "samreskjumálmur" (samreskja is the Icelandic adaptation of Russian name "samarski", after other Old Icelandic adaptations of Russian toponyms: polotsk (Pallteskja) and Smolensk (Smáleskja).  The construction for plutonium becomes: samreskjublý (samarish lead).

Tungsten:
Another one for tungsten. The international name is "wolfram", named after the nickname  of the mineral scheelite "lupi spuma" (froth of the wolf), because it devoured tin in the smelter. It is, however not necessary make reference to a wolf: átfrauðmálmur (át- (eating away, corroding) + frauð (foam) + málmur (metal), or átfrauðglit, a construction in which "glit" stands for "metallic lustre".