Periodic Table/Nobelium
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102No259 Da

Nobelium

Actinide·Period 7·f-block

Radioactive metallic transuranic element, belongs to the actinoids. Seven known isotopes exist, the most stable being No-254 with a half-life of 255 seconds. First identified with certainty by Albert Ghiorso and Glenn T. Seaborg in 1966. Unnilbium has been proposed as an alternative name.

Gallery

This is only an illustration, not nobelium itself. Nobelium can only be made in very small amounts and emits strong radiation of various kinds.

Chemical Elements A Virtual Museum under a Creative Commons Attribution 3.0 Unported License, source: https://images-of-elements.com/nobelium.php

Bohr model of Nobelium

Physical Propertiesmass · density · phase · crystal

Atomic Mass

259Da

Density

9.9000g/cm³

Phase (STP)

Solid

Melting Point

1100.2K

Boiling Point

—

Molar Heat

—

Crystal Structure

—

Atomic Radiiatomic · covalent · van der Waals

Atomic (Empirical)

—

Covalent

176.00pm

Van der Waals

246.00pm

Electronic Propertieselectronegativity · ionization · affinity

Electron Configuration

[Rn] 5f14 7s2

Electron Shells

2, 8, 18, 32, 32, 8, 2

Electronegativity

—

Electron Affinity

—

1st Ionization Energy

6.6kJ/mol

Oxidation States

+2, +3

Orbital DiagramAufbau · Hund's rule · Pauli exclusion

↑↓
1s2
↑↓
2s2
↑↓
↑↓
↑↓
2p6
↑↓
3s2
↑↓
↑↓
↑↓
3p6
↑↓
↑↓
↑↓
↑↓
↑↓
3d10
↑↓
4s2
↑↓
↑↓
↑↓
4p6
↑↓
↑↓
↑↓
↑↓
↑↓
4d10
↑↓
↑↓
↑↓
↑↓
↑↓
↑↓
↑↓
4f14
↑↓
5s2
↑↓
↑↓
↑↓
5p6
↑↓
↑↓
↑↓
↑↓
↑↓
5d10
↑↓
6s2
↑↓
↑↓
↑↓
6p6
↑↓
↑↓
↑↓
↑↓
↑↓
↑↓
↑↓
5f14
↑↓
7s2

Full: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 5f14 7s2Short: [Rn] 5f14 7s2

Ionization Energies (102 known)

1st6.6 kJ/mol2nd12.9 kJ/mol3rd25.8 kJ/mol4th41.5 kJ/mol5th60.0 kJ/mol6th74.0 kJ/mol7th97.0 kJ/mol8th119.0 kJ/mol9th140.0 kJ/mol10th170.0 kJ/mol11th187.0 kJ/mol12th216.0 kJ/mol13th246.0 kJ/mol14th267.0 kJ/mol15th285.0 kJ/mol16th312.0 kJ/mol17th341.0 kJ/mol18th367.0 kJ/mol19th394.0 kJ/mol20th422.0 kJ/mol21th448.0 kJ/mol22th475.0 kJ/mol23th496.0 kJ/mol24th520.0 kJ/mol25th701.0 kJ/mol26th734.0 kJ/mol27th768.0 kJ/mol28th805.0 kJ/mol29th840.0 kJ/mol30th875.0 kJ/mol31th934.0 kJ/mol32th969.0 kJ/mol33th1010.0 kJ/mol34th1045.0 kJ/mol35th1220.0 kJ/mol36th1260.0 kJ/mol37th1300.0 kJ/mol38th1350.0 kJ/mol39th1500.0 kJ/mol40th1550.0 kJ/mol41th1680.0 kJ/mol42th1730.0 kJ/mol43th1920.0 kJ/mol44th2010.0 kJ/mol45th2110.0 kJ/mol46th2200.0 kJ/mol47th2290.0 kJ/mol48th2380.0 kJ/mol49th2470.0 kJ/mol50th2570.0 kJ/mol51th2680.0 kJ/mol52th2760.0 kJ/mol53th2860.0 kJ/mol54th2950.0 kJ/mol55th3050.0 kJ/mol56th3140.0 kJ/mol57th3627.0 kJ/mol58th3705.0 kJ/mol59th3790.0 kJ/mol60th3878.0 kJ/mol61th3962.0 kJ/mol62th4045.0 kJ/mol63th4234.0 kJ/mol64th4320.0 kJ/mol65th4413.0 kJ/mol66th4500.0 kJ/mol67th4850.0 kJ/mol68th4930.0 kJ/mol69th5030.0 kJ/mol70th5110.0 kJ/mol71th5750.0 kJ/mol72th5850.0 kJ/mol73th6110.0 kJ/mol74th6210.0 kJ/mol75th9680.0 kJ/mol76th9860.0 kJ/mol77th10060.0 kJ/mol78th10270.0 kJ/mol79th10470.0 kJ/mol80th10660.0 kJ/mol81th11200.0 kJ/mol82th11410.0 kJ/mol83th11630.0 kJ/mol84th11840.0 kJ/mol85th12420.0 kJ/mol86th12600.0 kJ/mol87th12800.0 kJ/mol88th12980.0 kJ/mol89th15000.0 kJ/mol90th15200.0 kJ/mol91th15600.0 kJ/mol92th15800.0 kJ/mol93th31700.0 kJ/mol94th32200.0 kJ/mol95th32700.0 kJ/mol96th33200.0 kJ/mol97th40500.0 kJ/mol98th41200.0 kJ/mol99th42100.0 kJ/mol100th42632.0 kJ/mol101th166050.0 kJ/mol102th168804.0 kJ/molSuccessive Ionization Energies

Abundanceby mass

Biological Role

No biological role

Synthetic, radioactive element. No biological role.

Discovery

Discovered By

Nobel Institute for Physics

Named By

—

Year

1957

Nuclear Data

Known Isotopes

17

Stable Isotopes

1

Stable Mass Numbers

248

Isotopes of No17 known

NuclideZNMass (AMU)Half-lifeDecayJπAbundance
248Nostable102146248.086623StableSF0+—
249No102147249.08780257.0 μsβ⁺, α5/2+—
250No102148250.0875655.08 μsSF (1%), α, β⁺0+—
262No102160262.107463UnknownSF (1%), α0+—
263No102161263.110714Unknownα, SF——
264No102162264.112734Unknownα, SF0+—

Click any isotope for its full page with decay chain:

248No249No250No251No252No253No254No255No256No257No258No259No260No261No262No263No264No
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