"Ásbrúarsvell" (iridium, Ir 77), "keisaramálmur" and "hrapvottssilfri"

 Iridium, the most corrosion-resistant metal known, the "noblest" of metals in chemical sense, the  "emperor-metal" (keisaramálmur), because it resist "kóngavatn" (king's water, aqua regia, the strongest acid so called because it disolves the "king of metals" gold), can be named after the many colours of its salts, which was the orgin of the international name. And it can be done with a "poetic kenning"! Iridium derives from "iris" (rainbow). Irdidescence can be expressed by the adjective "lithverfur" or "róf-", "rófrænn" (in "rófsjá" (spectroscope), but could be used as a prefix too, expressing "colour-variety". And last but certainly not least we have the old poetic kenning "ásbrú", the bridge of the Aesir, which was a rainbow.  For the second part of the name we can take an old poetic name for "silver": "svell" (gleaming ice-layer): "mundar svell" (mund (hand), "mundar-' (of the hand) + svell,  the "gleaming ice layer of the hands, silver) or "fetils svell" (the gleaming sword).  Iridium is a platinum-group metal and the name "platina" is a Spanish diminutive of "plata" (silver). Iridium is silvery-white so the use of "svell" in a kenning-name for the "keisaramálmur" is appropriate "ásbrúarsvell": So three words are possible for iridiu: keisaramálmur, ásbrúarsvell and hrapvottssilfri, because iridium is the "witness of the giant space rock that impacted on Earth thereby killing  the dinosaurs.  A small layer of iridium in a layer that was 66 million years old was found all around the planet, which can only be of meteoric origin. Iridium is the "impact-witness element".

Tímaguðsefni (titanium), léttjerni, forguðaglit or korneskaefni

 1) Tímaguðsefni

The name "titanium" was given by Martin Klaproth, in accordance with his views on chemical nomenclature in the counter-flow of the French chemical school, where they tried to name the element by its chemical properties. Since the German researcher himself noted the impossibility of determining the properties of a new element only by its oxide, he chose a name for it from mythology, by analogy with uranium that he had previously discovered.  

It is, therefore, reasonable to base the Icelandic on the international word.  Because there's no Icelandic word for this name of deities, and a translation of the German "Himmerstürmer" with addition of "-efni" would generate a word that is way to long.  An alternative way is naming the element after the leader of the Titans, Kronos, the god of time. This results into the word "Tímaguðsefni", of which the first two characters coincidentially are the same as the element's symbol.  

2) Léttjerni

Titanium is well known for its combination of lightness and strenght and is used iron-alloys.  It is a member of the so-called "iron-group of transition metals".  I propose the ending -jerni for these elements.  Some might say that "-jerni" sounds like a member of the "ferromagnetic triad" (iron, cobalt and nickel). But that depends which word you suffix.  The construction "léttjerni" suggest something that is lighter than iron, so this metal can't belong to the ferromagnetic triad.  Using "léttjerni" for iron consisting of the lightest stable isotop would be terminological illogical. Scandium is often excluded form the "iron-group of transition metals because it belongs to the "rare-earth elements". For that reason "léttjerni" could be used for titanium.

3) Forguðaglit

The Titans were the 12 Gods that preceded the 12 Olympians and have become a symbol for "the elder gods", the predecessing family of Gods: Fornguða- or Forguða- + glit (metallic lustre): Forguðaglit

4) Korneskaefni (Cornium)

Named after Cornwalls, because that's where titanium was discovered. Many elements are named after the countries or regions, where they were discovered, in this case "Cornwalls".

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)