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Lawrencium, ₁₀₃Lr

Lawrencium
Pronunciation	/lɒˈrɛnsiəm/ (lo-REN-see-əm) /ləˈrɛnsiəm/ (lə-REN-see-əm)
Appearance	silvery (predicted)
Mass number	[266]
Lawrencium in the periodic table
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 Lu ↑ Lr ↓ — nobelium ← lawrencium → rutherfordium
Atomic number (Z)	103
Group	group 3
Period	period 7
Block	d-block
Electron configuration	[Rn] 5f 7s 7p
Electrons per shell	2, 8, 18, 32, 32, 8, 3
Physical properties
Phase at STP	solid (predicted)
Melting point	1900 K ​(1600 °C, ​3000 °F) (predicted)
Density (near r.t.)	14.4 g/cm (predicted)
Atomic properties
Oxidation states	common: +3
Electronegativity	Pauling scale: 1.3 (predicted)
Ionization energies	1st: 479 kJ/mol 2nd: 1428.0 kJ/mol (predicted) 3rd: 2219.1 kJ/mol (predicted)
Other properties
Natural occurrence	synthetic
Crystal structure	​hexagonal close-packed (hcp) (predicted)
CAS Number	22537-19-5
History
Naming	after Ernest Lawrence
Discovery	Lawrence Berkeley National Laboratory and Joint Institute for Nuclear Research (1961–1971)
Isotopes of lawrencium v e
Main isotopes Decay Isotope abun­dance half-life (t1/2) mode pro­duct Lr synth 31 s α Md β No Lr synth 28 s α Md β No Lr synth 3.0 min α Md β No Lr synth 39 min SF – Lr synth 4 h β No SF – Lr synth 4.8 h SF – Lr synth 11 h SF –
Category: Lawrencium view talk edit | references

Wikipedia Categories

• Actinides
• Lawrencium
• Chemical elements
• Transition metals
• Synthetic elements
• CS1: long volume value
• Pages including recorded pronunciations
• Chemical elements with hexagonal close-packed structure

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