Platin

Symbol	Pt
Atomnummer	78
Gruppe	10 (Nikkelgruppe)
Periode	6
Blok	d
Klassifikation	Overgangsmetal

Udseende	Silvery white
Farve	Grå

Antal protoner	78 p+
Antal neutroner	117 n0
Antal elektroner	78 e-

Fra Wikipedia, den gratis encyklopædiPlatin (af platina, spansk for "lille sølv") er det 78. grundstof i det periodiske system, og har det kemiske symbol Pt: Under normale tryk- og temperaturforhold optræder dette overgangsmetal som et tungt, sølvskinnende og korrosionsbestandigt metal. Den første reference til platin er fra 1557 skrevet af Julius Scaliger. Platin udgør sammen med iridium og osmium de tunge platinmetaller.

Fase ved STP	Fast
Massefylde	21.45 g/cm3
Atommasse	195.085 u

Smeltepunkt	2041.4 K 1768.25 °C 3214.85 °F
Kogepunkt	4098 K 3824.85 °C 6916.73 °F
Fordampningsvarme	510.45 kJ/mol

Elektronegativitet (Pauling Scale)	2.28
Elektronaffinitet	205.041 kJ/mol
Oxidationstrin	−3, −2, −1, 0, +1, +2, +3, +4, +5, +6 (a mildly basic oxide)
Ioniseringsenergier	870 kJ/mol 1791 kJ/mol

Elektronkonfiguration Kortfattet konfiguration	[Xe] 4f14 5d9 6s1
Elektronkonfiguration Fuld konfiguration	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d9 6s1
Elektronkonfigurationsdiagram	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d9 6s1
Elektroner pr. Skal	2, 8, 18, 32, 17, 1
Outer shell electrons	1
Valence electrons (incl. d)	10
Valency-elektroner	2,4
Bohrs atommodel	Figur: Skaldiagram af Platin (Pt) atom.
Orbital diagram 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s

Opdaget

Antonio de Ulloa (1735)

Opdagelse af platin Archaeologists have discovered traces of platinum in the gold used in ancient Egyptian burials as early as 1200 BCE. The first European reference to platinum appears in 1557 in the writings of the Italian humanist Julius Caesar Scaliger as a description of an unknown noble metal found between Darién and Mexico, "which no fire nor any Spanish artifice has yet been able to liquefy". In 1735, Antonio de Ulloa and Jorge Juan y Santacilia saw Native Americans mining platinum while the Spaniards were travelling through Colombia and Peru for eight years. Ulloa and Juan found mines with the whitish metal nuggets and took them home to Spain. Antonio de Ulloa returned to Spain and established the first mineralogy lab in Spain and was the first to systematically study platinum, which was in 1748. His historical account of the expedition included a description of platinum as being neither separable nor calcinable. Ulloa also anticipated the discovery of platinum mines. After publishing the report in 1748, Ulloa did not continue to investigate the new metal. In 1752, Henrik Scheffer published a detailed scientific description of the metal, which he referred to as "white gold", including an account of how he succeeded in fusing platinum ore with the aid of arsenic. Scheffer described platinum as being less pliable than gold, but with similar resistance to corrosion.

Original word	platina
Language of origin	Spanish
Name source	Egenskaber
Meaning	“Little silver”
Naming The name is derived from the Spanish 'platina', meaning 'little silver', the name used by 16th-century South American miners who considered it a nuisance metal.

CAS Number	7440-06-4
ChemSpider ID	22381
EC number	231-116-1
PubChem CID Number	23939