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Berkelium Bk (Element 97) of Periodic Table

Berkelium Bk (Element 97) of Periodic Table

97 Bk (Berkelium)

Appearance – Silvery (Radioactive)

Mass number – 247

Atomic weight – 247.0703 g/mol

Atomic number (Z) – 97

Electrons: 97

Protons:97

Neutron:150

Period – 7

Block – f

Element category – Actinide

Electrons per shell – K2, L8, M18, N32, O27, P9, Q2

Electron configuration – 1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p65f97s2

Phase – Solid

Melting point:  1259 k (986 oC)

Boiling point: 2900 k (2627 oC)

Density – α 14.78 g/cm3, β 13.25 g/cm3

Half Life (s): 435×108

Lifetime (s): 628×108

Decay mode: α decay

Neutron cross-section (Barns): 710

Heat of fusion – 7.92 kJ/mol

Oxidation states – 2, 3, 4

Electronegativity – 1.3

Valence – 4

Ionization energies – 1st: 601 kJ/mol

Atomic radius – 170 pm

Crystal structure – Double hexagonal close-packed

Grid parameters – a=3.416, c=11.07

Attitude c/a – 3.24

Thermal conductivity – 10 W/(m•k)

Magnetic ordering – Paramagnetic

CAS Number – 7440-40-6

Naming – After Berkeley, California where it was discovered

Discovery – Lawrence Berkeley National Laboratory (1949)

Isotopes – 245Bk 246Bk 247Bk 248Bk 249Bk

Uses – Because it is so rare, berkelium has no commercial or technological use at present.

Biological role – It is toxic due to its radioactivity

Natural abundance –  It is made in nuclear reactors by the neutron bombardment of plutonium-239

#Berkelium

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