Group+4Hr2


 * //__ Transition Metals __//**

Symbol **-** Ti Atomic Number **-** 22 Atomic Mass - 47.867 Discovered By - William Gregor in 1791 Uses - One of the strongest and lightest metals we know of. Has excellent resistances to water, so it is used for propeller shafts and rigging and in the heat exchangers of desalination plants and in heater-chillers for salt water aquariums. Used to produce relatively soft gemstones. Main metal used in joint replacements, due to its inertness, the body doesn't regard it as a threat.
 * //__Titanium__//**

Symbol **-** Zr Atomic Number - 40 Atomic Mass - 91.22 Discovered By - Martin Heinrich Klaproth in 1789 Uses - A very corrosive resistant material. So it is used by manufactures that use corrosive ingredients in the production of their products. It becomes a superconductor at low temperatures, so its used in an alloy form with niobium in the production of superconductor magnets. Used to give greater strength to lightweight alloys, use in ceramics give a low cost color and glazes with low toxicity. Used in jewelry and is cut to look like diamond.
 * //__Zirconium__//**

Symbol - Hf Atomic Number **-** 72 Atomic Mass - 178.49 Discovered By - Dirk Coster in 1923 Uses- Found in zirconium and has to be refined out. The most common use of hafnium is in nuclear reactors used for control rods. Used in hafnium reactors and the hafnium bomb.
 * //__Hafnium__//**

Symbol - Rf Atomic Number **-** 102 Atomic Mass - 261 Discovered By - A Soviet team led by G. N. Flerov in 1964 Uses - None. Its a highly radioactive element and the most stable isotope of rutherfordium, has a half life of about 70 seconds.
 * //__Rutherfordium__//**

Sources: en.wikipedia.org/wiki/Group_4_element http://web-o-rama.net/titanium/1uses.html http://www.biophysica.com/titanium.htm http://www.chemistry.pomona.edu/Chemistry/periodic_table/Elements/Zirconium/Zirconium.htm http://education.jlab.org/itselemental/ele040.html http://www.facts-about.org.uk/science-element-hafnium.htm http://education.jlab.org/itselemental/ele072.html http://pt.chemicalstore.com/Rf%20-%20Rutherfordium.htm http://www.infoplease.com/encyclopedia/rutherfordium