101 - Mendelevium actinide
Discovered by Lawrence Berkeley Laboratory in 1955
Mendelevium is a synthetic element with chemical symbol Md (formerly Mv) and atomic number 101. A metallic radioactive transuranic element in the actinide series, it is the first element that currently cannot be produced in macroscopic quantities through neutron bombardment of lighter elements. It is the antepenultimate actinide and the ninth transuranic element.
Periodic table
| Shell | Electrons | Orbitals |
|---|---|---|
| 1 | 2 | 2 in 1s |
| 2 | 8 | 2 in 2s + 6 in 2p |
| 3 | 18 | 2 in 3s + 6 in 3p + 10 in 3d |
| 4 | 32 | 2 in 4s + 6 in 4p + 10 in 4d + 14 in 4f |
| 5 | 31 | 2 in 5s + 6 in 5p + 10 in 5d + 13 in 5f |
| 6 | 8 | 2 in 6s + 6 in 6p |
| 7 | 2 | 2 in 7s |
Electron shells
258 u Atomic Mass
15 Group
3 Common Oxidation States
10.3 g/cm³ Density
93.9 kJ/mol Electron Affinity
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f13 Electron Configuration
[Rn] 5f13 7s2 Electron Configuration (semantic)
1.3 Electronegativity
101 Electrons
6.58 eV First Ionization Energy
635 kJ/mol Ionization Energies
36 Mendeleev Number
7 Number of Shells
157 Neutrons
101 Atomic Number
33 Number of Isotopes
2, 3 Oxidation States
7 Period
Solid Phase
101 Protons