Es
Einsteinium (Atomic Number 99)
Category: actinide | Period 7, Group 3 | Block: f
Highly radioactive synthetic actinide named after Albert Einstein.
Atomic & Physical Constants
- Standard Atomic Weight:
- 252 u
- Standard State Phase:
- Synthetic
- Electron Configuration:
- 2, 8, 18, 32, 29, 8, 2
- Electronegativity (Pauling):
- 1.3
- Melting Point:
- 1133 K
- Boiling Point:
- 1269 K
Historical Discovery & Real-World Applications
Industrial & Scientific Uses
Fundamental heavy actinide chemical bonding research
Discovery History
Discovered by Lawrence Berkeley National Laboratory (1952).
Study Einsteinium with Socratic AI Tutor
Get step-by-step orbital hybridization, oxidation state derivations, and reaction practice questions.