|Stockholm—Carl Gustaf Mosander elements|
- Mosander found two impurities,
- both oxides,
- in his oxide of yttrium—one yellow
- and the other rose.
- Having named yttrium from the first syllable
- of the village where it was found, Ytterby,
- and the second after the second syllable,
- he named the third after the trailing letters, erb.
- Mosander named the rose oxide terbia,
- and the yellow oxide erbia,
- but Berlin named terbia erbia,
- so Marc Delafontaine named erbia terbia.
Atomic number 68
- Erbium doping is used in amplifier-lasers
- for fiber optics and long-distance transmission.
- Erbium-doped yttrium aluminium garnet lasers
- are useful in surgery and in dentistry.
- Erbium oxide’s pink color makes it useful
- in glass, glazes, porcelain, and cheap jewellery.
- Erbium improves the workability and increases
- the softness of vanadium alloys.
Tweedledee and Tweedledum
- They stick together, with
- similar desires, similar fears.
- Instead of poking fun at them,
- let’s respect them as equals.
- Our imaginary friends
- don’t laugh at themselves.