Atomic number 102
Nobelium
Actinide
No photo: here’s why
Nobelium 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
- 259.00
- Group
- –
- Period
- 7
- State (STP)
- solid
- Electronegativity
- 1.30
- Common ox. states
- +2, +3
Properties
[Rn] 5f¹⁴ 7s²
- Ionization energy
- 642.0 kJ/mol
- Electron affinity
- –
- Melting point
- 1100.00 K (826.9 °C)
- Boiling point
- –
How dangerous is it?
Made just a few atoms at a time and gone in moments, this element is studied only as the briefest trace inside a lab.
- RadioactiveImmediate and cumulative
Each atom is very short lived and strongly radioactive, decaying away almost as soon as it forms. (never exists outside a lab in any amount you could see)
Created and observed only as single atoms inside shielded equipment at a few labs.
How it bonds· family overview
Nobelium (No) is an actinide. Like the lanthanides it tends toward a +3 oxidation state, but the early actinides (Th–Am) routinely access +4, +5, +6, even +7 because the 5f electrons are easier to ionize. Most actinides are radioactive; their "bonding" in school is read off the periodic table, not measured in lab.
