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Research Elements

Francium

Fr · atomic number 87

Alkali metal · period 7, group 1

Electrons

Fr

[Rn] 7s1

Shells: 2, 8, 18, 32, 18, 8, 1

Valence electrons: 1 in the outer shell (7s1)

  • Outer s and p
  • Core

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.