Mendelevium (Md) Properties and Facts

Element 101 - Actinide

What are the basic properties of Mendelevium?

Mendelevium (symbol: Md) is a actinide with atomic number 101. Its atomic mass is 258.0 u, and it belongs to period 7 and group 3.

What is the electron configuration of Mendelevium?

The electron configuration is: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 6s²

What are the physical properties of Mendelevium?

Melting point: 1100.0 K
Boiling point: 1100.0 K
Density: 10.3 g/cm³

What are the known isotopes of Mendelevium?

  • Md-256: Half-life of 1.6 hours
  • Md-257: Half-life of 5.52 hours
  • Md-258: Half-life of 51.5 days
  • Md-259: Half-life of 1.6 hours
  • Md-260: Half-life of 31.8 days

What is the biological role and occurrence of Mendelevium?

Biological role: Highly radioactive and toxic
Natural occurrence: Synthetic element

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