The name ruthenium is derived from the Latin word Ruthenia for Russia, because it was first discovered there. As a noble metal it doesn't like to react with other elements and can rarely be found on earth.
The name iridium is derived from the greek word Iris, the Greek goddess of the rainbow, because iridium-compounds are very colourful. It is supposed to be the most corrosion-resistant element. It is used in many appliances, where persistence is important, for example in pen tips.
Technetium is the smallest radioactive element and thus a great exception among its neighbouring elements. It was the first artificially made element leading to its name: the Greek word technētós means "artificial".
Technicus the monster looks like put together from various spare parts. It wants to belong to the "good guys". But because of its radioactivity the other monsters avoid it.
Niobium was named after Niobe the daughter of Tantalos, who is namesake of tantalum – the element right below niobium in the periodic table. It is commonly used as an addition to stainless steel alloys.
The name zirconium is taken from the mineral zircon (ZrSiO4). The word is derived from the persischen wort zargun for „gold-like“. It is used for example in nuclear power plants as a casing for the fuel rods, or to produce bright sparks in flashbulbs and fireworks.
Yttrium is always grouped with other rare earth elements. It was discovered in the small place of Ytterby in Sweden, which it is named after.
Yttri the monster is the smallest of the Ytterbie family.
Gold is the undebated king of the elements. No other has such a high significance – it’s proverbial. If all the gold in the world was melted into a cube, it would be just 20 meters long.
Auro is the king of the Elemonsters world. He is dignified, majestic and very conceited.
Silver has always played the second fiddle after gold. On the other hand we encounter it much more often in our every-day-life: In mirrors, in cutlery, in jewelry, as coating in band aids... It is even useful for making water drinkable.
Argenta is the queen at Auros side. But she is much more practical than her husband. She even has a poetic side: the moon is her sister in spirit.
Vanadium is found in high concentrations in some creatures like Tunicates and the mushroom Amanita muscaria (fly agaric). Its predominantely used in steel production to increase strength.
Vanadia the monster is a bit vain...