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Research Elements

Promethium

Pm · atomic number 61

Lanthanide · period 6

Electrons

Pm

[Xe] 4f5 6s2

Shells: 2, 8, 18, 23, 8, 2

Valence electrons: 2 in the outer shell (6s2), and 5 in 4f5

  • Outer s and p
  • d and f
  • 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.