Lanthanum,  57La
General properties
Appearancesilvery white
Lanthanum in the دوری جدول
Hydrogen (diatomic nonmetal)
Helium (noble gas)
Lithium (alkali metal)
Beryllium (alkaline earth metal)
Boron (metalloid)
Carbon (polyatomic nonmetal)
Nitrogen (diatomic nonmetal)
Oxygen (diatomic nonmetal)
Fluorine (diatomic nonmetal)
Neon (noble gas)
Sodium (alkali metal)
Magnesium (alkaline earth metal)
Aluminium (post-transition metal)
Silicon (metalloid)
Phosphorus (polyatomic nonmetal)
Sulfur (polyatomic nonmetal)
Chlorine (diatomic nonmetal)
Argon (noble gas)
Potassium (alkali metal)
Calcium (alkaline earth metal)
Scandium (transition metal)
Titanium (transition metal)
Vanadium (transition metal)
Chromium (transition metal)
Manganese (transition metal)
Iron (transition metal)
Cobalt (transition metal)
Nickel (transition metal)
Copper (transition metal)
Zinc (transition metal)
Gallium (post-transition metal)
Germanium (metalloid)
Arsenic (metalloid)
Selenium (polyatomic nonmetal)
Bromine (diatomic nonmetal)
Krypton (noble gas)
Rubidium (alkali metal)
Strontium (alkaline earth metal)
Yttrium (transition metal)
Zirconium (transition metal)
Niobium (transition metal)
Molybdenum (transition metal)
Technetium (transition metal)
Ruthenium (transition metal)
Rhodium (transition metal)
Palladium (transition metal)
Silver (transition metal)
Cadmium (transition metal)
Indium (post-transition metal)
Tin (post-transition metal)
Antimony (metalloid)
Tellurium (metalloid)
Iodine (diatomic nonmetal)
Xenon (noble gas)
Caesium (alkali metal)
Barium (alkaline earth metal)
Lanthanum (lanthanide)
Cerium (lanthanide)
Praseodymium (lanthanide)
Neodymium (lanthanide)
Promethium (lanthanide)
Samarium (lanthanide)
Europium (lanthanide)
Gadolinium (lanthanide)
Terbium (lanthanide)
Dysprosium (lanthanide)
Holmium (lanthanide)
Erbium (lanthanide)
Thulium (lanthanide)
Ytterbium (lanthanide)
Lutetium (lanthanide)
Hafnium (transition metal)
Tantalum (transition metal)
Tungsten (transition metal)
Rhenium (transition metal)
Osmium (transition metal)
Iridium (transition metal)
Platinum (transition metal)
Gold (transition metal)
Mercury (transition metal)
Thallium (post-transition metal)
Lead (post-transition metal)
Bismuth (post-transition metal)
Polonium (post-transition metal)
Astatine (metalloid)
Radon (noble gas)
Francium (alkali metal)
Radium (alkaline earth metal)
Actinium (actinide)
Thorium (actinide)
Protactinium (actinide)
Uranium (actinide)
Neptunium (actinide)
Plutonium (actinide)
Americium (actinide)
Curium (actinide)
Berkelium (actinide)
Californium (actinide)
Einsteinium (actinide)
Fermium (actinide)
Mendelevium (actinide)
Nobelium (actinide)
Lawrencium (actinide)
Rutherfordium (transition metal)
Dubnium (transition metal)
Seaborgium (transition metal)
Bohrium (transition metal)
Hassium (transition metal)
Meitnerium (unknown chemical properties)
Darmstadtium (unknown chemical properties)
Roentgenium (unknown chemical properties)
Copernicium (transition metal)
Nihonium (unknown chemical properties)
Flerovium (unknown chemical properties)
Moscovium (unknown chemical properties)
Livermorium (unknown chemical properties)
Tennessine (unknown chemical properties)
Oganesson (unknown chemical properties)
Y

La

Ac
bariumlanthanumcerium
جوہری عدد (Z)57
Group, periodgroup 3, period 6
Blockf-block
Standard atomic weight (Ar)138.90547
برقی تشکیل[Xe] 5d1 6s2
Electrons per shell
2, 8, 18, 18, 9, 2
Physical properties
Phasesolid
نقطۂ انجماد1193 کیلون ​(920 °C, ​1688 °F)
نقطہ کھولاؤ3737 K ​(3464 °C, ​6267 °F)
کثافت near درجہ حرارت کمرہ6.162 g/cm3
when liquid, at m.p.5.94 g/cm3
سخانۂ ائتلاف6.20 جول فی مول
Heat of 402.1 kJ/mol
Molar heat capacity27.11 J/(mol·K)
بخاری دباؤ (extrapolated)
پ (پاسکل) 1 10 100 1 کے 10 کے 100 کے
 دح پر (کیلون) 2005 2208 2458 2772 3178 3726
Atomic properties
تکسیدی عددs3, 2 (strongly basic oxide)
برقی منفیتPauling scale: 1.10
جوہری رداسempirical: 187 پیکومیٹر
Covalent radius207±8 pm
Miscellanea
قلمی ساختhexagonal
Hexagonal crystal structure for lanthanum
آواز کی رفتار thin rod2475 m/s (at 20 °C)
حرارتی پھیلاؤ(r.t.) (α, poly) 12.1 µm/(m·K)
حر ایصالیت13.4 W/(m·K)
مزاحمیت(r.t.) (α, poly) 615 n Ω·m
مقناطیسیتparamagnetic[1]
Young's modulus(α form) 36.6 GPa
Shear modulus(α form) 14.3 GPa
Bulk modulus(α form) 27.9 GPa
Poisson ratio(α form) 0.280
موس پیمانہ2.5
Vickers hardness491 MPa
Brinell hardness363 MPa
کیمیائی شعبۂ اخلاص اندراجی عدد7439-91-0
Main isotopes of lanthanum
ہم جا Abun­dance ہاف لائف (t1/2) اشعاعی تنزل Pro­duct
137La syn 60,000 yrs ε 0.600 137Ba
138La 0.09% 1.05×1011yrs ε 1.737 138Ba
بیٹا تنزل 1.044 138Ce
139La 99.91% 82 تعدیلوں کیساتھ La مستحکم ہے
| references | in Wikidata

References

  1. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics (PDF)۔ CRC press۔ 2000۔ ISBN 0849304814