nobelium

nobelium (chemical element)

Periodic table location

atomic symbol | No atomic number | 102 short electronic configuration | [Rn]7s^25f^14 Aufbau diagram | 5f 7s block | f period | 7 atomic mass | 259 u (unified atomic mass units) (atomic mass number given for longest-lived known isotope) half-life | 170 minutes

melting point | 827 °C (rank: 56th) (properties at standard conditions)

valence | 3 electronegativity | 1.3 first ionization energy | 642 kJ/mol (kilojoules per mole) ionization energies | 642 kJ/mol

term symbol | ^1S_0 (electronic ground state properties)

solar abundance | 0 mass% meteorite abundance | 0 mass% crust abundance | 0 mass% ocean abundance | 0 mass% human abundance | 0 mass% solar molar abundance | 0 mol% meteorite molar abundance | 0 mol% ocean molar abundance | 0 mol% crust molar abundance | 0 mol% human molar abundance | 0 mol%

half-life | 170 min lifetime | 5.6 h (rank: 1st) specific radioactivity | 116258 TBq/g decay mode | alpha emission nuclear spin | No-248: 0^+ | No-249: 5/2^+ | No-250: 0^+ | No-251: 7/2^+ | No-252: 0^+ | No-253: 9/2^- | No-254: 0^+ | No-255: 1/2^+ | No-256: 0^+ | No-257: 7/2^+ | No-258: 0^+ | No-259: 9/2^+ | No-260: 0^+ | No-261: 3/2^+ | No-262: 0^+ | No-264: 0^+ unstable isotopes | No-261 (170 min) | No-259 (58 min) | No-263 (20 min) | No-255 (190 s) | No-253 (97.2 s) | No-264 (60 s) | No-254 (51 s) | No-257 (25 s) | No-256 (2.91 s) | No-252 (2.44 s) | No-251 (800 ms) | No-260 (106 ms) | No-262 (5 ms) | No-258 (1.2 ms) | No-249 (57 µs) | No-250 (4.2 µs) | No-248 (2 µs)

CAS number | 10028-14-5