Mendelevium is a synthetic element wi chemical seembol Md (umwhile Mv) an atomic nummer 101.

Mendelevium, 101Md
Mendelevium
Pronunciation/ˌmɛndəˈlviəm/ (MEN-də-LEE-vee-əm)
Mass number[258]
Mendelevium 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 Gowd 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
Tm

Md

(Upt)
fermiummendeleviumnobelium
Atomic nummer (Z)101
Groupgroup n/a
Periodperiod 7
Blockf-block
Element category  Actinide
Electron confeeguration[Rn] 5f13 7s2
Electrons per shell2, 8, 18, 32, 31, 8, 2
Pheesical properties
Phase at STPsolit (predictit)
Meltin pynt1100 K ​(827 °C, ​1521 °F) (predictit)
Atomic properties
Oxidation states+2, +3
ElectronegativityPauling scale: 1.3
Ionisation energies
  • 1st: 635 kJ/mol
  • (estimate)
Ither properties
Naitural occurrencesynthetic
CAS Nummer7440-11-1
History
Naminefter Dmitri Mendeleev
DiskiveryLawrence Berkeley Naitional Laboratory (1955)
Main isotopes o mendelevium
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct 257Md syn 5.52 h ε 257Fm
α 253Es
SF
258Md syn 51.5 d ε 258Fm
260Md syn 31.8 d SF
α 256Es
ε 260Fm
β 260No
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