Lanthanide -
		The lanthanide group has fifteen metallic chemical elements. The atomic numbers go
		through fifty-seven and seventy-one. They are termed lanthanide because the lighter
		elements in the series are chemically similar to lanthanum. 

		Lanthanum (La) - 
		Has the atomic number 57. It is a chemical element that is silvery white and is the
		first element in the lanthanide series. Lanthanum is found in some rare earth minerals
		and is usually mixed with cerium and other rare earth elements.
		
		Cerium (Ce) - 
		Has the atomic number 58. It is a soft silvery, ductile metal that oxidizes in air easily,
		it is also named after the dwarf planet Ceres (The Roman goddess of agriculture). Cerium
		is the most abundant of the rare earth elements making up about 0.0046 percent of the
		earths crust weight.  
		
		Praseodymium (Pr) -
		Has the atomic number 59. It is a soft, silvery, malleable and ductile metal and is too
		reactive to be found it native form and when artificially prepared it slowly develops
		a green oxide coating.
		
		Neodymium (Nd) -
		Has the atomic number 60. It is a chemical element and a soft silvery metal that
		tarnishes in air. Neodymium is not found naturally in metallic form or unmixed with other
		lanthanides but is refined down for general use. also it is classified as "rare earth"
		it is very common, and no rarer than nickel, cobalt and copper. Most of the neodymium in
		the world is mined in china.
		
		Promethium (Pm) -
		Has the atomic number 61. Every one of its isotopes are radioactive so it is one of the
		only two such elements. It is named after the titan in greek mythology Prometheus who
		stole fire from Mount Olympus and gave it to humans. It is formed from rare decays of
		natural europium-151.
		
		Samarium (Sm) -
		Has the atomic number 62. It is a chemical element that is silvery and readily oxidizes
		in air. It is slightly toxic. Samarium was discovered by the French chemist Paul Emile
		Lecoq de Boisbaudran. Also it is known as a rare earth metal it is the 40th most abundant
		element in the earths crust.
		
		Europium (Eu) -
		Has the atomic number 63. It is a fairly hard, silvery metal that easily oxidizes with
		air and water, and is a chemical element. Europium is only slightly toxic compared to
		other heavy metals. 
		
		Gadolinium (Gd) -
		Has the atomic number 64. It is a silvery-white, malleable and a rare earth metal. It is
		found naturally only when combined with salt. It is used for shielding in nuclear reactors
		because of how easily it absorbs neutrons.
		
		Terbium (Tb) - 
		Has the atomic number 65. It is a silvery-white rare earth metal that is soft enough to be
		cut with a knife. Terbium is not found in nature as a free element. Most of the worlds
		terbium is used in green phosphors.
		
		Dysprosium (Dy) -
		Has the atomic number 66. It is a rare earth metal that has a metallic silvery look.Dysprosium
		is never found naturally as a free element although it is found in various minerals. It is
		used for it high thermal neutron absorption making it used for making control rods in nuclear
		reactors.
		
		Holmium (Ho) -
		Has the atomic number 67. It is a soft, silvery-white rare earth element that is too reactive
		to be found uncombined in nature but is somewhat stable in dry air at room temperature. In water
		it rusts quickly and will burn in air if it is heated.
		
		Erbium (Er) -
		Has the atomic number 68. It is a solid, silvery-white metal when artificially isolated. Erbium
		is always found in chemical combinations with other elements on earth.
		
		Thulium (Tm) -
		Has the atomic number 69. It is a silvery-grey metal that is the second least abundant of the
		lanthanides after promethium. It is fairly soft and slowly tarnishes in air. Thulium is used
		in portable x-rays and solid state laser.
		
		Ytterbium (Yb) -
		Has the atomic number 70. It is a silvery-white metal that is mainly used as a dopant of
		stainless steel or active laser media, or less commonly, a gamma ray source. Ytterbium is one
		of the less common rare earth metals and is mined in the United States, China, India and Brazil.
		
		Lutetium (Lu) -
		Has the atomic number 71. It is a silvery-white metal that resists corrosion in dry air but not
		moist air. Lutetium is the last element in the lanthanide series which was originally thought
		to be an impurity of the mineral ytterbia. It is not particularly abundant element but is much
		more common than silver in the earths crust.