Symbol	Po
Atomnummer	84
Gruppe	16 (Chalkogener)
Periode	6
Blok	p
Klassifikation	Andre metaller

Udseende	Silvery
Farve	Sølv

Antal protoner	84 p+
Antal neutroner	125 n0
Antal elektroner	84 e-

Fra Wikipedia, den gratis encyklopædiPolonium (opkaldt efter Marie Curies oprindelsesland Polen, fra det latinske navn for Polen "Polonia"[1]) er et grundstof med atomnummer 84 i det periodiske system, og har det kemiske symbol Po. Det har flere isotoper end noget andet grundstof og de er alle radioaktive. Eksempelvis er polonium-210 en alfakilde.

Fase ved STP	Fast
Massefylde	9.196 g/cm3
Atommasse	209 u

Smeltepunkt	527 K 253.85 °C 488.93 °F
Kogepunkt	1235 K 961.85 °C 1763.33 °F
Fordampningsvarme	120 kJ/mol

Elektronegativitet (Pauling Scale)	2
Elektronaffinitet	136 kJ/mol
Oxidationstrin	−2, +2, +4, +5, +6 (an amphoteric oxide)
Ioniseringsenergier	812.1 kJ/mol

Elektronkonfiguration Kortfattet konfiguration	[Xe] 4f14 5d10 6s2 6p4
Elektronkonfiguration Fuld konfiguration	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p4
Elektronkonfigurationsdiagram	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p4
Elektroner pr. Skal	2, 8, 18, 32, 18, 6
Valenselektroner	6
Valency-elektroner	2,4,6
Bohrs atommodel	Figur: Skaldiagram af Polonium (Po) atom.
Orbital diagram 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s 6p

Opdaget	Pierre Curie, Marie Curie (1898)
Første isolation	Willy Marckwald (1902)
Navngivet af	Pierre Curie, Marie Curie
Opdagelse af polonium Tentatively called "radium F", polonium was discovered by Marie and Pierre Curie in July 1898, when it was extracted from the uranium ore pitchblende and identified solely by its strong radioactivity: it was the first element to be so discovered. It was named after Marie Curie's native land of Poland (Latin: Polonia). Poland at the time was under Russian, German, and Austro-Hungarian partition, and did not exist as an independent country. It was Curie's hope that naming the element after her native land would publicize its lack of independence. Polonium may be the first element named to highlight a political controversy. German scientist Willy Marckwald successfully isolated 3 milligrams of polonium in 1902, though at the time he believed it was a new element, which he dubbed "radio-tellurium", and it was not until 1905 that it was demonstrated to be the same as polonium.

CAS Number	7440-08-6
ChemSpider ID	4886482
EC number	231-118-2
PubChem CID Number	6328143