Lutetium Element in Periodic Table | Atomic Number Atomic Mass
Lutetium is the last chemical element in the lanthanide series of periodic table. It is represented by the symbol Lu and its atomic number is 71. Like all other lanthanide elements, lutetium is also silvery-white in colour. Surprisingly, the atomic size of Lu is the smallest among the lanthanide atoms (contradictory to the conventional increasing size with increase atomic number) giving rise to the concept called “lanthanide contraction”. Consequently,Lu possesses the highest density, hardness of all the lanthanides and has a higher melting point and boiling point than its congeners, at 1652 °C and 3402°C.
Lutetium mildly reacts with air losing its metallic luster under normal conditions of temperature and pressure, but combines readily with oxygen to form lutetium oxide at a higher temperature of 150°C. Similar to other lanthanides, Lu is slow to react with cold water but it reacts vigorously with hot water to form lutetium hydroxide, with release of hydrogen. Lu reacts with all halogens to form respective lutetium trihalides which are soluble in water, except lutetium fluoride.
Lu occurs in nature as a mixture of two isotopes with mass numbers 175 and 176. Lutetium-175 is considered to be more stable. In addition to the natural isotopes, as many as 32 synthetic isotopes were prepared with varying masses from Lu-150 to Lu-184. Furthermore, Lu is found to exist in 42 nuclear isomeric forms.
Uses Of Lutetium Element:
Lu is used as a detector in Positron Emission Tomography(PET) scanning in diagnosis of cancer. Lutetium tantalite is used in X-ray phosphors. Lutetium isotopes are used in treating neural tumours and alleviating bone-related maladies.
Lutetium Element Information:
Discovered by :Carl Auer von Welsbach and Georges Urbain
Atomic number: 71
Relative atomic mass: 174.967
Electron configuration: [Xe] 4f14 5d1 6s2
Other elements in the same block:
Cerium, Praseodymium, Neodymium, Promethium, Samarium, Europium, Gadolinium, Terbium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium, Thorium, Protactinium, Uranium, Neptunium, Plutonium, Americium, Curium, Berkelium, Californium, Einsteinium, Fermium, Mendelevium, Nobelium and Lawrencium are the elements in the same block.
Period: period 6
Other elements in the same period:
Caesium, Barium, Lanthanum, Cerium, Praseodymium, Neodymium, Promethium, Samarium, Europium, Gadolinium, Terbium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium, Hafnium, Tantalum, Tungsten, Rhenium, Osmium, Iridium, Platinum, Gold, Mercury, Thallium, Lead, Bismuth, Polonium, Astatine and Radon
Other elements in the same group:
Other elements in the same orbital:
Key isotopes: 175Lu
Melting point: 1663°C, 3025°F, 1936 K
Boiling point: 3402°C, 6156°F, 3675 K
Element category: lanthanide
Density (g cm−3): 9.84
CAS number: 7439-94-3
Color: silvery white
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