Md
Mendelevium
Element 101 · Actinide
Mendelevium (Md)
Mendelevium is a synthetic radioactive element named after the father of the periodic table.
- Actinide
- Period 7
- f-block series
- f-block
- solid at room temperature
- ☢ Radioactive
Key properties
- Atomic mass
- [258]
- u
- Electron configuration
- [Rn] 5f13 7s2
- Melting point
- 826.9 °C
- 1,100 K
- Boiling point
- —
- Density
- —
- Electronegativity
- 1.3
- Pauling
- Atomic radius
- —
- 1st ionisation energy
- 6.58 eV
Compare with every element:Electronegativity chartAtomic radius chartIonisation energy chartDensity chart of the elementsMelting point chartElectron configuration chart
Did you know?
Notable facts about mendelevium
- 01
The first experiment produced just 17 atoms of mendelevium.
- 02
It was the first element made one atom at a time.
- 03
Naming it after a Russian scientist during the Cold War was a notable gesture.
Applications
What is mendelevium used for?
- Research
History
Discovery & name origin
Discovered by
Albert Ghiorso, Bernard G. Harvey, Gregory R. Choppin, Stanley G. Thompson, Glenn T. Seaborg
Year
Where
United States
Name origin
From Dmitri Mendeleev, creator of the periodic table.
Atomic structure
Atomic properties
Atomic structure
Atomic properties
- Atomic number
- 101
- Atomic mass
- [258] u
- Group
- Actinides (3)
- Period
- 7
- Block
- f-block
- Electron configuration
- [Rn] 5f13 7s2
- Full configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f13
- Electrons per shell
- 2, 8, 18, 32, 31, 8, 2
- Electronegativity (Pauling)
- 1.3
- Electron affinity
- —
- Atomic radius (van der Waals)
- —
- Stable isotopes
- None — all isotopes are radioactive
Oxidation states
Highlighted: common oxidation states (+3, +2).
Physical
Physical properties & colour
Physical
Physical properties & colour
- State at 20 °C
- Solid
- Melting point
- 1,100 K · 826.9 °C · 1,520.3 °F
- Boiling point
- —
- Density
- —
- Molar heat capacity
- —
- Appearance
- —
- CPK model colour
- Copied
The CPK colour is the convention used for this element’s atoms in molecular models.
FAQ
Mendelevium questions
What is Md on the periodic table?
Md is the symbol for mendelevium, element 101 on the periodic table. It sits in period 7, in the f-block, in the actinide category, and has an atomic mass of [258].
What is the atomic number of mendelevium?
Mendelevium has atomic number 101, so every mendelevium atom has 101 protons in its nucleus. Its symbol is Md and its atomic mass is [258].
Who discovered mendelevium?
Mendelevium was discovered by Albert Ghiorso, Bernard G. Harvey, Gregory R. Choppin, Stanley G. Thompson and Glenn T. Seaborg in 1955 (United States). The name comes from from Dmitri Mendeleev, creator of the periodic table.
What is mendelevium used for?
Mendelevium is used for: research.
Is mendelevium a metal?
Yes. Mendelevium is a actinide, one of the metallic elements.
What is the electron configuration of mendelevium?
The electron configuration of mendelevium is [Rn] 5f13 7s2. Its 101 electrons are arranged in shells as 2, 8, 18, 32, 31, 8, 2.