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Research Elements

Technetium

Tc · atomic number 43

Transition metal · period 5, group 7

Electrons

Tc

[Kr] 4d5 5s2

Shells: 2, 8, 18, 13, 2

Valence electrons: 2 in the outer shell (5s2), and 5 in 4d5

  • 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.