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Research Elements

Rutherfordium

Rf · atomic number 104

Transition metal · period 7, group 4

Electrons

Rf

[Rn] 5f14 6d2 7s2

Shells: 2, 8, 18, 32, 32, 10, 2

Valence electrons: 2 in the outer shell (7s2), and 2 in 6d2

  • Outer s and p
  • d and f
  • Core

Predicted by calculation; not yet measured. Green dots are the outer shell's s and p electrons. Softer green dots are the d electrons of transition metals, and the d and f electrons of lanthanides and actinides: they often take part in bonding, but not always. Grey dots are the core. Ground-state configuration from the NIST Atomic Spectra Database (A. Kramida, Yu. Ralchenko, J. Reader and the NIST ASD Team).

Natural isotopes

No natural isotope with a defined abundance in NIST's Atomic Weights and Isotopic Compositions.