Fermium (Fm) Properties and Facts

Element 100 - Actinide

What are the basic properties of Fermium?

Fermium (symbol: Fm) is a actinide with atomic number 100. Its atomic mass is 257.0 u, and it belongs to period 7 and group 3.

What is the electron configuration of Fermium?

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

What are the physical properties of Fermium?

Melting point: 1800.0 K
Boiling point: 2100.0 K
Density: 9.7 g/cm³

What are the known isotopes of Fermium?

  • Fm-253: Half-life of 3 days
  • Fm-254: Half-life of 3.2 hours
  • Fm-255: Half-life of 20 hours
  • Fm-256: Half-life of 2.6 hours
  • Fm-257: Half-life of 100.5 days

What is the biological role and occurrence of Fermium?

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

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