1) Maríumálmur: Mary's metal, what other chemical element could answer to this description more appropriately than Radium. The blue substance which she is often depicted with is the compound 'radium chloride' (Icelandic: saltsúr maríumálmur)
2) Magnablý: Radium-isotopes are mostly daughters of isotopes of Thorium, the first element in the actinide series, which was named after the Nordic god Thor. The name can easily be icelandicized as 'þórsblý'. We than can built further on this name and terminologically isolate the element radium in Icelandic. The son of Thor was called Magni, so Radium becomes Magnablý. The second part of the compound 'blý' (lead) is used here as a positioner of metals heavier than lead, most of which desintegrate through alpha-emission ultimately into 'lead'.: e.g. Heljarblý (Plutonium), Maríublý (Polonium), Kanablý (Americium), Ægisblý (Neptunium), Elfráðsblý (Noberlium), Lafransblý (Lawrensium), Mundilleifsblý (Mendelevium), Áablý (Uranium)
3) Móðir geislalofts, móðir blýþungs lofts (kenning-like description of radium, of which 'radon' is a daughter product. That's the reason why 'radon' was formed from the name 'radium'.
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