Nobelium No (Element 102) of Periodic Table

102 No (Nobelium)

Mass number – 259

Atomic weight – 259.1009 g/mol

Atomic number (Z) – 102

Electrons: 102

Protons: 102

Neutrons: 157

Period – 7

Block – f

Element category – Actinide

Electron per shell – K2, L8, M18, N32, O32, P8, Q2

Electron configuration – 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p⁶4f¹⁴5d¹⁰6s²6p⁶5f¹⁴7s²

Phase – Solid

Melting point – 1100 k (827 ^oC)

Density – 9.9(4) g/cm³

Half Life(s) – 10000

Lifetime(s) – 20000

Appearance –  is a radioactive metal

Oxidation states – 2, 3

Electronegativity – Pauling scale: 1:3

Valence – 3

Ionization energies – 1st: 641.6 kJ/mol, 2nd: 1254.3 kJ/mol, 3rd: 2605.1 kJ/mol

Atomic radius – 285 pm

Crystal structure – Face-centered cubic

CAS Number – 10028-14-5

Naming – After Alfred Nobel

Discovery –  Joint Institute for Nuclear Research (1963)

Isotopes – 253_No 254_No 255_No 257_No 259_No

Uses – Nobelium has no uses outside research.

Natural abundance – Nobelium is made by bombarding curium with carbon in a device called a cyclotron.

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