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Lawrencium Lr (Element 103) of Periodic Table

Lawrencium Lr (Element 103) of Periodic Table

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

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