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Bohrium Bh (Element 107) of Periodic Table

Bohrium Bh (Element 107) of Periodic Table

107 Bh (Bohrium)

Mass number – 270

Atomic weight – 264 g/mol

Atomic number (Z) – 107

Electrons: 107

Protons:107

Neutrons: 163

Group – 7

Period – 7

Block – d

Element category – Transition metal

Electrons per shell – K2, L8, M18, N32, O32, P13, Q2

Electron configuration – 1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p65f146d57s2

Phase – Solid

Density – 37.1 g/cm3

Half Life(s) – 5400

Lifetime (s) – 7800

Appearance – Highly radioactive metal

Oxidation states – 7, 5, 4, 3

Ionization energies – 1st: 742.9 kJ/mol, 2nd: 1688.5 kJ/mol, 3rd: 2566.5 kJ/mol

Atomic radius – 128 pm

Covalent radius – 141 pm

Crystal structure – Hexagonal close-packed

CAS Number – 54037-14-8

Naming – After Niels Bohr

Discovery – GSI Helmholtz Centre for Heavy Ion Research in Darmstadt, Germany (1981)

Isotopes – 278Bh 274Bh 272Bh 271Bh 270Bh 267Bh

Uses – At present, bohrium is of research interest only.

Natural abundance – It was created by the so-called ‘cold fusion’ method. This involved the bombardment of bismuth with atoms of chromium.

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