Hermóðsdögg or Hermóðardögg (kvikasilfur)

Mercury is the only metal for which the alchemical planetary name became the common name. The god Mercury was the quick messenger of the gods, hence the synonym "quicksilver". The Nordic equivalent is Hermóður, the messengergod nick-named "hinn hvati" (the speedy one).  Because mercury looks like dewdrops, I decided to call the element "Hermóðsdögg".

Ormsilfri (Platinum), Ormsilfringar (platinum-group elements)

Fáfnir was a dwarf in Old Norse mythology who was cursed by gold.  The construction "Ormsilfur" (the serpent's silver) doesn't make sense at first glance, but can be used for platinum, which has its name from it silvery appearance (Spanish: plata (silver) + "-ina" (dimninutive suffix) , platina, the little silver). In Icelandi "hvítagull" (white gold) has been used, because the element is situated next to gold and looks like silver, so "ormsilfur" works for "platinum"!

For the Platinum group of elements: Ru, Rh, Pd, Os, Ir, Pt the term Ormsilfringar can be used.

Elfarylfri (rhenium)

The construction "ylfri" for W (tungsten, wolfram) is a combination of "ylfi", a neuter noun derived from "úlfur" (a translation of the first part of "Wolfram") with addition of the first "r" in the second member "-ram", which makes the word sound like the dative of "silfur", silfri.  "Ylfi" on its own doesn't sound like the name of a metallic element. Addition of the "r" in "ram" does: ylfri

Rhenium was named after the river Rhine and is positioned right next to tungsten (wolfram): Elfar-ylfri, a funny rhyme word.  I like it.

So we have three words for rhenium

1) torsuðumálmur (highest boiling point)

2) elfarylfri (the "wolfram" (tungsten) named after a river (Rhine))

3) eðalþungsteinn (noble tungsten. Rhenium is a noble metal)

Fjandlyfti (Flúr)

 The most corrosive gaseous element is the halogen fluorine. Fjandlyfti

Germanium: saxefni, hálftin, ofurkísli and blendismelmingur

 Germanium:

So there are four possible names for germanium:

1) saxefni (the element was found in "Saxland" (Saxony) in Germany, so instead of naming it after the whole country, Germany , we can name it after the specific provinc, saxony: SAXONIUM (saxefni)

2) blendismelmingur: Germanium is commercially extracted from the zinc ore "sphalerite"  or "zinc blende"(ZnS). Just like the term "salt" originally designated only NaCl before it's meaning was broadened to designate "substances produced by the reaction of an acid with a base", "blendi" on itself was used for "Sphalerite". In Icelandic "sinkblendi" is used, but one can use "blendi" in Icelandic in the original narrower meaning. The fpur metallic elements, commercially extracted from sphalerite are: gallium (blendisál, closest to aluminium), cadmium (blendissilfur, closest to "silver"), indium (blendistin, closest to "tin") and germanium (blendismelmingur, the only "metalloid" (orðabanki: "málmbróðir", "málmungur", "mélmingur") extracted form "sphalerite"). So "blendismelminger" (I chose a compound with "melmingur" because of the vocal harmony) means "the metalloid in sphalerite".

ofurkísli (eka-silicon, the kind of terminology used by Medelejev before the element was discovered, the heavier brother of silicon)

hálftin (lying between silicon and tin, constructed after the word: hálfþrítugur, which doesn't mean 20 but 35)