103 Lr (Lawrencium)
Appearance – Silvery (radioactive metal)
Mass number – 262
Atomic weight – 266.1193 g/mol
Atomic number (Z) – 103
Electrons: 103
Protons: 103
Neutrons: 159
Group – 3
Period – 7
Block – d
Element category – Actinide
Electrons per shell – K2, L8, M18, N32, O32, P8, Q3
Electron configuration – 1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p65f147s27p1
Phase – Solid
Melting point – 1900 k (1627 oC)
Density – ~15.6 – 16.6 g/cm3
Half Life(s) – 36000
Lifetime – 52000
Oxidation states – 3
Electronegativity – Pauling scale 1:3
Ionization energies – 1st: 478.6 kJ/mol, 2nd: 1428 kJ/mol, 3rd: 2219.1 kJ/mol
Atomic radius – 282 pm
Crystal structure – Hexagonal close-packed
CAS Number – 22537-19-5
Naming – After Ernest Lawrence
Discovery – Lawrence Berkeley National Laboratory and Joint Institute for Nuclear Research (1961 – 1971)
Isotopes – 266Lr 262Lr 261Lr 260Lr 259Lr 256Lr 255Lr 254Lr
Uses – Lawrencium has no uses outside research
Natural abundance – It is produced by bombarding californium with boron
#Lawrencium