Magnesium

Symbol	Mg
Atomnummer	12
Gruppe	2 (Jordalkalimetaller)
Periode	3
Blok	s
Klassifikation	Jordalkalimetal

Udseende	Shiny grey solid
Farve	Sølv

Antal protoner	12 p+
Antal neutroner	12 n0
Antal elektroner	12 e-

Fra Wikipedia, den gratis encyklopædiMagnesium (opkaldt efter distriktet Magnesia i Grækenland), tidligere også kaldet magnium, er det 12. grundstof i det periodiske system, og har det kemiske symbol Mg. Under normale temperatur- og trykforhold optræder det som et sølvblankt, let og stærkt metal.

Fase ved STP	Fast
Massefylde	1.738 g/cm3
Atommasse	24.304 u

Smeltepunkt	923 K 649.85 °C 1201.73 °F
Kogepunkt	1363 K 1089.85 °C 1993.73 °F
Fordampningsvarme	127.6 kJ/mol

Elektronegativitet (Pauling Scale)	1.31
Elektronaffinitet	-40 kJ/mol
Oxidationstrin	+1, +2 (a strongly basic oxide)
Ioniseringsenergier	737.7 kJ/mol 1450.7 kJ/mol 7732.7 kJ/mol 10542.5 kJ/mol 13630 kJ/mol 18020 kJ/mol 21711 kJ/mol 25661 kJ/mol 31653 kJ/mol 35458 kJ/mol 169988 kJ/mol 189368 kJ/mol

Elektronkonfiguration Kortfattet konfiguration	[Ne] 3s2
Elektronkonfiguration Fuld konfiguration	1s2 2s2 2p6 3s2
Elektronkonfigurationsdiagram	1s2 2s2 2p6 3s2
Elektroner pr. Skal	2, 8, 2
Valenselektroner	2
Valency-elektroner	2
Bohrs atommodel	Figur: Skaldiagram af Magnesium (Mg) atom.
Orbital diagram	1s 2s 2p 3s

Opdaget	Joseph Black (1755)
Første isolation	Humphry Davy (1808)
Navngivet af	Humphry Davy (1812)
Opdagelse af magnesium The name magnesium originates from the Greek word for locations related to the tribe of the Magnetes, either a district in Thessaly called Magnesia or Magnesia ad Sipylum, now in Turkey. The metal was first isolated by Sir Humphry Davy in England in 1808. He used electrolysis on a mixture of magnesia and mercuric oxide. Antoine Bussy prepared it in coherent form in 1831. Davy's first suggestion for a name was magnium, but the name magnesium is now used in English and all major European languages but Russian.

Original word	Magnesia
Language of origin	Greek
Name source	Sted
Meaning	“Magnesia district”
Land	Greece
Naming The name is derived from the Greek word Magnesia, a district of Eastern Thessaly in Greece where the mineral magnesia alba was first found.

CAS Number	7439-95-4
ChemSpider ID	4575328
EC number	231-104-6
PubChem CID Number	5462224