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Rutherfordium Rf (Element 104) of Periodic Table

Rutherfordium Rf (Element 104) of Periodic Table

104 Rf (Rutherfordium)

Mass number – 267

Atomic weight – 261 g/mol

Atomic number (Z) – 104

Electrons: 104

Protons: 104

Neutrons: 163

Group – 4

Period – 7

Block – d

Element category – Transition metal

Electrons per shell – K2, L8, M18, N32, O32, P10, Q2

Electron configuration – 1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p65f146d27s2

Phase – Solid

Melting point – 2400 k (2100 oC)

Boiling point – 5800 k (5500 oC)

Density – 23.2 g/cm3

Half Life(s) – 47000

Lifetime(s) – 68000

Appearance – Radioactive metal that doesn’t occur naturally

Oxidation states – 4, 3, 2

Ionization energies – 1st: 579.9 kJ/mol, 2nd: 1389 kJ/mol, 3rd: 2296.4 kJ/mol

Atomic radius – 150 pm

Covalent radius – 157 pm

Crystal structure – Hexagonal close-packed

CAS Number – 53850-36-5

Naming – After Ernest Rutherford

Discovery – Joint Institute for Nuclear Research and Lawrence Berkeley National Laboratory (1964, 1969)

Isotopes – 261Rf 263Rf 265Rf 266Rf 267Rf

Uses – At present, it is only used in research.

Natural abundance – It is created by bombarding californium-249 with carbon-12 nuclei

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