101
Md
Mendelevium
Mendelevium
Mendelevium (Md)
Actinides · Solid · Period 7 · Group 3
Element Properties
- Atomic Number
- 101
- Symbol
- Md
- Atomic Mass
- 258.0984
- Category
- Actinides
- Standard State
- Solid
- Period
- 7
- Group
- 3
- Electronegativity
- 1.3
- Atomic Radius
- —
- Ionization Energy
- 6.58
- Electron Affinity
- —
- Oxidation States
- +3, +2
- Melting Point
- 1100 K (826.85 °C)
- Boiling Point
- —
- Density
- —
- Electron Configuration
- [Rn]7s2 5f13
- Year Discovered
- 1955
Electron shells
[Rn]7s2 5f13
Electrons are arranged in shells (principal energy levels) around the nucleus. The diagram is a schematic — orbitals in the same shell are not drawn separately.
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Frequently asked questions
What is the atomic number of Mendelevium?
The atomic number of Mendelevium is 101, which equals the number of protons in its nucleus.
What is the atomic mass of Mendelevium?
The atomic mass of Mendelevium is approximately 258.0984 u (one twelfth of the mass of a carbon-12 atom).
What is the electron configuration of Mendelevium?
The electron configuration of Mendelevium is [Rn]7s2 5f13.
Where is Mendelevium in the periodic table?
Mendelevium is located in period 7, group 3.
When was Mendelevium discovered?
Mendelevium was discovered in 1955.
Related elements
Same group
21
Sc
Scandium
44.956
39
Y
Yttrium
88.906
57
La
Lanthanum
138.905
58
Ce
Cerium
140.116
59
Pr
Praseodymium
140.908
60
Nd
Neodymium
144.24