|Stockholm—Carl Gustaf Mosander elements|
- Carl Gustof Mosander found,
- lying hidden in a sample of cerite,
- an oxide of a new rare earth, which
- he named “that which lies hidden.”
- Little did he know that lying hidden
- in “that which lies hidden” were five
- other rare earths—gadolinium, praseodymium,
- neodymium, samarium, and europium.
Atomic number 57
- Lanthanum is used
- in steel alloys
- and molybdenum alloys.
- Mischmetal of lanthanum
- and other rare earths
- are in the anode
- of nickel-metal hydride batteries
- and in lighter flints.
- Lanthanum oxide is in
- vacuum-tube emitters
- glass that resists alkali,
- glass that absorbs infrared,
- glass for camera and telescope lenses,
- and electrodes for gas tungsten arc welding.
- A lurking suspicion.
- A recessive gene
- causing a bias
- an unexpected response.
- A hidden pattern.
- An unexplained secret.
- A mystery, an enigma.
- The element of surprise.