Indium

Indium,  ₄₉In

General properties
Appearance	sillery lustrous gray
Staundart atomic wecht (Ar, staundart)	7002114818000000000♠114.818(1)
Indium in the periodic cairt
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercur (element) Thallium Leid (element) Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium Ga ↑ In ↓ Tl cadmium ← indium → tin
Atomic nummer (Z)	49
Group	group 13 (boron group)
Period	period 5
Element category	post-transition metal
Block	p-block
Electron confeeguration	[Kr] 4d10 5s2 5p1
Electrons per shell	2, 8, 18, 18, 3
Pheesical properties
Phase (at STP)	solit
Meltin pynt	429.7485 K ​(156.5985 °C, ​313.8773 °F)
Bylin pynt	2345 K ​(2072 °C, ​3762 °F)
Density (near r.t.)	7.31 g/cm3
when liquid (at m.p.)	7.02 g/cm3
Treeple pynt	429.7445 K, ​~1 kPa
Heat o fusion	3.281 kJ/mol
Heat o vapourisation	231.8 kJ/mol
Molar heat capacity	26.74 J/(mol·K)
Vapour pressur P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 1196 1325 1485 1690 1962 2340
Atomic properties
Oxidation states	3, 2, 1 (amphoteric oxide)
Electronegativity	Pauling scale: 1.78
Atomic radius	empirical: 167 pm
Covalent radius	142±5 pm
Van der Waals radius	193 pm
Spectral lines
Miscellanea
Creestal structur	​tetragonal
Speed o soond thin rod	1215 m/s (at 20 °C)
Thermal expansion	32.1 µm/(m·K) (at 25 °C)
Thermal conductivity	81.8 W/(m·K)
Electrical resistivity	83.7 n Ω·m (at 20 °C)
Magnetic orderin	diamagnetic
Young's modulus	11 GPa
Mohs haurdness	1.2
Brinell haurdness	8.83 MPa
CAS Nummer	7440-74-6
History
Diskivery	Ferdinand Reich an Hieronymous Theodor Richter (1863)
First isolation	Hieronymous Theodor Richter (1867)
Main isotopes o indium
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct 113In 4.29% - (SF) 115In 95.71% 4.41×1014 y β− 115Sn
Decay modes in parentheses are predictit, but hae nae yet been observed

Indium is a chemical element wi seembol In an atomic nummer 49. This rare, very saft, malleable an easily fusible puir hivy metal is chemically seemilar tae gallium an thallium, an shaws intermediate properties atween thir twa. Indium wis discovered in 1863 an named for the indigo blue line in its spectrum that wis the first indication o its existence in zinc ores, as a new an unkent element. The metal wis first isolatit in the follaein year. Zinc ores continue tae be the primary soorce o indium, whaur it is foond in compoond form. Very rarely the element can be foond as grains o native (free) metal, but thir are nae o commercial importance.