Menachem Begin High School, Safed, Israel
Ytterbium: Ytterbium's main use is in fiber lasers used for cutting thick metals, hence the object in the top right corner — the laser. Fiber lasers emit the colors of the spectrum when used. Ytterbium can be used to convert infra-red light to red and green. The Yb is drawn with lines shaped as rays because Ytterbium isotopes are known to emit gamma rays. The inside of the "b" is a clock because it has the potential to keep time more accurately than the caesium fountain clock; it is accurate to within a second every 100 million years.
Yehoshua Sivan, Menachem Begin High School, Safed, Israel
Number of isotopes:
* Haynes, W. M. (2011). CRC Handbook of Chemistry and Physics, 91st edition: http://www.hbcponline.com/ Retrieved April 7, 2011
** Winter, M. (2010). Home of the Periodic Table. Retrieved April 8, 2011, from Web Elements: http://www.webelements.com/