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Research Elements

Meitnerium

Mt · atomic number 109

Transition metal · period 7, group 9

Electrons

Mt

[Rn] 5f14 6d7 7s2

Shells: 2, 8, 18, 32, 32, 15, 2

Valence electrons: 2 in the outer shell (7s2), and 7 in 6d7

  • 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. Configuration from relativistic calculations; NIST lists ground states up to element 108.

Natural isotopes

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