Rutherfordium

104

Ef

(265)

  • Name: Rutherfordium
  • Symbol: Ef
  • Atomic number: 104
  • Atomic weight: (265)
  • CAS Registry ID: 53850-36-5
  • Group name: (none)
  • Period number: 7
  • Block: d-block
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Description

Rutherfordium is a transition metal that is one of the synthetic elements. Not much is known about this element, but it is predicted to have chemical traits similar to the element hafnium. Rutherfordium has an atomic number of 256. The melting points and boiling points of this element are not known, and it is presumed to be a solid though that has not been confirmed. To date, there are no commercial uses for the rutherfordium element, and no predicted uses have yet surfaced.

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Isolation

Rutherfordium does not exist in nature. It can only be synthesized for very brief periods of time using specialized equipment.

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Throughout the short history of rutherfordium, it has been artificially synthesized in two ways. The first synthesis of rutherfordium took place in 1964. At that time different types of plutonium and neon isotopes were used. The procedures consisted of bombarding a plutonium isotope, number 242, with MeV neon ions, numbers 113 – 115, that had been accelerated. From this process, trace amounts of rutherfordium presented themselves as nuclear fission tracks. These tracks were indentified with a specific type of microscope and glass. The second synthesis of rutherfordium occurred in 1969. At this time the elements calcium and californium were used. During the process, the two elements were stimulated to undergo high energy collisions which resulted in minute amounts of rutherfordium. The isotopes of rutherfordium are highly radioactive and they have a very brief half life; the most stable isotope of rutherfordium has a half life of only 13 hours. The synthesis of rutherfordium is so specialized that it has not been synthesized in any amount which can be studied thus far.


General
Name Rutherfordium
Symbol Rf
Number 104
Chemical series transition metals
Group 4
Period 7
Block d
Appearance unknown
Standard atomic weight (265)  g·mol−1
Electron configuration presumed [Rn] 5f14 6d2 7s2
Electrons per shell 2, 8, 18, 32, 32, 10, 2
Atomic properties
Crystal structure cubic body centered
Oxidation states 3, 4
Electronegativity
Ionization energies 1st: 580 kJ/mol
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Atomic radius
Atomic radius (calc.) 150 pm
Covalent radius 74 (calc.)  pm
Van der Waals radius
Physical properties
Phase solid
Density (near r.t.) 23 (est.)  g·cm−3
Liquid density at m.p.
Melting point
Boiling point
Critical point
Heat of fusion
Heat of vaporization
Heat capacity
Miscellaneous
Magnetic ordering
Electrical resistivity
Thermal conductivity
Thermal expansion
Speed of sound (thin rod)
Young's modulus
Shear modulus
Bulk modulus
Poisson ratio
Mohs hardness
Vickers hardness
Brinell hardness
CAS registry number 53850-36-5

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