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68
  Er  
167.260000
Erbium
      


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Name: Erbium
Symbol: Er
Atomic Number: 68
AtomicWeight: 167.260000
Family: Lanthanides
CAS RN: 7440-52-0
Description: A soft silvery white rare earth metal
State (25 °C): Solid
Melting Point: 1802 °K
Boiling Point: 3141 °K
Density: 9.066 g/cm3
Oxidation states: +3
Electron Configuration: [Xe] 4f126s2
Radius: 175 pm (Covalent)
Electronegativity: 1.24 (Pauling Scale)

1st Ionization Energy: 589 KJ/mole
2nd Ionization Energy: 1150 KJ/mole
3rd Ionization Energy: 2194 KJ/mole

      



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