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Fermium Fm (Element 100) of Periodic Table

Fermium Fm (Element 100) of Periodic Table

100 Fm (Fermium)

Mass number – 257

Atomic weight – 257.0951 g/mol

Atomic number (Z) – 100

Electrons: 100

Protons: 100

Neutrons: 157

Period – 7

Block – f

Element category – Actinide

Electrons per shell – K2, L8, M18, 32, O30, P8, Q2

Electron configuration – 1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p65f127s2

Phase – Solid

Melting point – 1800 k (1527 oC)

Density – 9.7(1) g/cm3

Half Life(s) – 8683000

LifeTime(s) – 12530000

Appearance –  Radioactive metal  

Oxidation states – 2, 3

Electnegativity – Pauling scale 1:3

Ionization energies – 1st: 627 kJ/mol

Crystal structure – Face-centered cubic

CAS Number – 7440-72-4

Naming – After Enrico Fermi

Discovery – Lawrence Berkeley National Laboratory (1952)

Isotopes – 252Fm 253Fm 255Fm 257Fm

Uses – Fermium has no uses outside research

Biological role –  Fermium is toxic due to its radioactivity.

Natural abundance – Fermium can be obtained, in microgram quantities, from the neutron bombardment of plutonium in a nuclear reactor

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