Einsteinium (Es) — Actinide. Atomic number 99.
Radioactive metallic solid
- Atomic number: 99
- Symbol: Es
- Atomic mass: [252] u
- Category: Actinide
- State: Solid
- Melting point: 859.85 °C / 1133 K
- Density: 8.84 g/cm³ (20°C)
- Electron configuration: [Rn] 5f11 7s2
- Oxidation states: +3
- Electronegativity: 1.3
- Discovered by: Albert Ghiorso and team (1952)
Common uses: Scientific research
Biological role: No biological role.
Frequently Asked Questions about Einsteinium
What is the atomic number of einsteinium?
Einsteinium has an atomic number of 99, meaning each atom contains 99 protons in its nucleus.
What is the atomic mass of einsteinium?
The standard atomic weight of einsteinium is [252] u (unified atomic mass units).
What category does einsteinium belong to?
Einsteinium is classified as a actinide.
What is the state of einsteinium at room temperature?
Einsteinium is a solid at 20 °C (68 °F).
What is the melting point of einsteinium?
The melting point of einsteinium is 859.85 °C / 1133 K.
What is the density of einsteinium?
The density of einsteinium is 8.84 g/cm³ (20°C).
What is the electronegativity of einsteinium?
Einsteinium has a Pauling electronegativity of 1.3.
What is the electron configuration of einsteinium?
The electron configuration of einsteinium is [Rn] 5f11 7s2.
What are the common oxidation states of einsteinium?
Einsteinium commonly exhibits the following oxidation states: +3.
When was einsteinium discovered?
Einsteinium was discovered in 1952 by Albert Ghiorso and team.
Is einsteinium radioactive?
Einsteinium is a synthetic radioactive element that does not occur naturally and must be produced in a laboratory.
What is the biological role of einsteinium?
No biological role.
What are the common uses of einsteinium?
Einsteinium is used for: Scientific research.
