101 Md (Mendelevium)

Mass number – 258

Atomic weight – 258.0951 g/mol

Atomic number (Z) – 101

Electrons: 101

Protons: 101

Neutrons: 157

Period – 7

Block – f

Element category – Actinide

Electrons per shell – K2, L8, M18, N32, O31, P8, Q2

Electron configuration – 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p⁶4f¹⁴5d¹⁰6s²6p⁶5f¹³7s²

Phase – Solid

Melting point – 1100 k (827 ^oC)

Density – 10.3(7) g/cm³

Half Life(s) – 4450000

Lifetime(s) – 6420000

Appearance – Radioactive metal

Atomic radius – 287 pm

Oxidation states – 2, 3

Electronegativity – Pauling scale: 1, 3

Valence – 3

Ionization energies – 1st: 653 kJ/mol

Crystal structure – Face-centered cubic

CAS Number – 7440-11-1

Naming – After Dmitri Mendeleev

Discovery – Lawrence Berkeley National Laboratory (1955)

Isotopes – 257_Md 258_Md 260_Md

Uses – Mendelevium is used only for research.

Natural abundance –  It is made by bombarding einsteinium with alpha particles (helium ions)

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