Es
252.000Einsteinium
Aynştaynyum
Einsteinium is a synthetic radioactive actinide with atomic number 99. It was discovered in Ivy Mike hydrogen bomb debris and is known for einsteinium-253, mendelevium synthesis and rare actinide spectroscopy research.
99
252 g/mol
[Rn] 5f¹¹ 7s²
2 | 8 | 18 | 32 | 29 | 8 | 2
1.3
8.84 g/cm³
859.9 °C
—
Albert Ghiorso
Einsteinium was discovered by Albert Ghiorso and collaborators in debris from the 1952 Ivy Mike hydrogen bomb test. The discovery remained classified until 1955 and the element was named after Albert Einstein.
Einsteinium-252
Half-life: About 471.7 days. Longest-lived einsteinium isotope, available only in minute quantities.Einsteinium-253
Half-life: About 20.5 days. Important isotope for research and mendelevium synthesis.EsCl₃
Einsteinium(III) ChlorideResearch compound for einsteinium chemistry.Es₂O₃
Einsteinium(III) OxideResearch compound inferred and studied in trace quantities.- Einsteinium-253 targets for synthesizing mendelevium
- Spectroscopy of actinide f-electron behavior
- Basic nuclear structure research
- Preparation of heavier actinides in specialized facilities
Einsteinium has no biological role. It is intensely radioactive and produced only in extremely small quantities, so biological studies are very limited.
- Einsteinium and fermium were identified from the debris of the first full-scale thermonuclear test.
- Einsteinium-253 was used in the first synthesis of mendelevium.
- Einsteinium is produced in such tiny amounts that many measurements require atom-counting or trace chemistry methods.
- Einsteinium has atomic number 99 and symbol Es.
- Its electron configuration is [Rn] 5f¹¹ 7s².
- Einsteinium commonly forms +3 compounds.
- Remember Es for Ivy Mike discovery and mendelevium synthesis.
What is the atomic number of einsteinium?
The atomic number of einsteinium is 99.
What is the electron configuration of einsteinium?
Einsteinium has the electron configuration [Rn] 5f¹¹ 7s².
What is einsteinium used for?
Einsteinium is used only in specialized research, including actinide spectroscopy and synthesis of heavier elements such as mendelevium.
How was einsteinium discovered?
Einsteinium was discovered in debris from the 1952 Ivy Mike hydrogen bomb test.
Who is einsteinium named after?
Einsteinium is named after Albert Einstein.