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.
#bohrium
