Atomic number 109
Meitnerium
Transition metal
No photo: here’s why
Meitnerium is a synthetic element made only in vanishingly small, intensely radioactive amounts - its atoms decay so quickly that no piece big enough to see or photograph has ever existed.
Quick facts
- Atomic mass
- 278.00
- Group
- 9
- Period
- 7
- State (STP)
- unknown
- Electronegativity
- –
- Common ox. states
- +3, +4, +6
Properties
[Rn] 5f¹⁴ 6d⁷ 7s²
- Ionization energy
- –
- Electron affinity
- –
- Melting point
- –
- Boiling point
- –
How dangerous is it?
A synthetic element known only from a few atoms made in a lab; each one decays in a fraction of a second and then is gone.
- RadioactiveImmediate
It is intensely radioactive in principle, yet it decays so fast that no real quantity ever forms.
Studied remotely by specialized teams behind shielding, never collected or stored.
How it bonds· family overview
Meitnerium (Mt) is a synthetic super-heavy element produced one atom at a time. Its position predicts d-block transition-metal chemistry - multiple oxidation states, oxide and halide salts - but only a handful of atoms have ever existed, so the chemistry is largely inferred from group trends.
