Erbium

Erbium, ₆₈Er

Erbium
Pípè	/ˈɜːrbiəm/ ​(UR-bee-əm)
Ìhànsójú	silvery white
Ìwúwo átọ̀mù Ar, std(Er)	167.259(3)
Erbium ní orí tábìlì àyè
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 Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver 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 Mercury (element) Thallium Lead 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 Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson - ↑ Er ↓ Fm holmium ← erbium → thulium
Nọ́mbà átọ̀mù (Z)	68
Ẹgbẹ́	group n/a
Àyè	àyè 6
Àdìpọ̀	Àdìpọ̀-f
Ẹ̀ka ẹ́límẹ́ntì	Lanthanide
Ìtò ẹ̀lẹ́ktrọ́nù	[Xe] 4f12 6s2
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan	2, 8, 18, 30, 8, 2
Àwọn ohun ìní ara
Ìfarahàn at STP	solid
Ìgbà ìyọ́	1802 K ​(1529 °C, ​2784 °F)
Ígbà ìhó	3141 K ​(2868 °C, ​5194 °F)
Kíki (near r.t.)	9.066 g/cm3
when liquid (at m.p.)	8.86 g/cm3
Heat of fusion	19.90 kJ/mol
Heat of	280 kJ/mol
Molar heat capacity	28.12 J/(mol·K)
pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 1504 1663 (1885) (2163) (2552) (3132)
Atomic properties
Oxidation states	0, +1, +2, +3 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment
Electronegativity	Pauling scale: 1.24
Atomic radius	empirical: 176 pm
Covalent radius	189±6 pm
Spectral lines of erbium
Other properties
Natural occurrence	primordial
Crystal structure	​hexagonal
Speed of sound thin rod	2830 m/s (at 20 °C)
Thermal expansion	(r.t.) (poly) 12.2 µm/(m·K)
Thermal conductivity	14.5 W/(m·K)
Electrical resistivity	(r.t.) (poly) 0.860 µ Ω·m
Magnetic ordering	paramagnetic at 300 K
Young's modulus	69.9 GPa
Shear modulus	28.3 GPa
Bulk modulus	44.4 GPa
Poisson ratio	0.237
Vickers hardness	589 MPa
Brinell hardness	814 MPa
CAS Number	7440-52-0
Main isotopes of erbium
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct 160Er syn 28.58 h ε 0.330 160Ho 162Er 0.139% 162Er is stable with 94 neutrons 164Er 1.601% 164Er is stable with 96 neutrons 165Er syn 10.36 h ε 0.376 165Ho 166Er 33.503% 166Er is stable with 98 neutrons 167Er 22.869% 167Er is stable with 99 neutrons 168Er 26.978% 168Er is stable with 100 neutrons 169Er syn 9.4 d β− 0.351 169Tm 170Er 14.910% 170Er is stable with 102 neutrons 171Er syn 7.516 h β− 1.490 171Tm 172Er syn 49.3 h β− 0.891 172Tm