Symbol	Na
Atomnummer	11
Gruppe	1 (Alkalimetaller)
Periode	3
Blok	s
Klassifikation	Alkalimetaller

Udseende	Silvery white metallic
Farve	Sølv

Antal protoner	11 p+
Antal neutroner	12 n0
Antal elektroner	11 e-

Fra Wikipedia, den gratis encyklopædiNatrium (af ægyptisk netjer og arabisk natrun der begge betyder natron; natrium er hovedbestanddelen i natron) er det 11. grundstof i det periodiske system og har det kemiske symbol Na. Under normale temperatur- og trykforhold optræder natrium som et blødt, sølvskinnende og kemisk meget reaktionsvilligt metal, som iltes ("ruster") hurtigt ved kontakt med atmosfærisk luft.

Fase ved STP	Fast
Massefylde	0.968 g/cm3
Atommasse	22.9898 u

Smeltepunkt	370.944 K 97.794 °C 208.0292 °F
Kogepunkt	1156.09 K 882.94 °C 1621.292 °F
Fordampningsvarme	98.01 kJ/mol

Elektronegativitet (Pauling Scale)	0.93
Elektronaffinitet	52.867 kJ/mol
Oxidationstrin	−1, +1 (a strongly basic oxide)
Ioniseringsenergier	495.8 kJ/mol 4562 kJ/mol 6910.3 kJ/mol 9543 kJ/mol 13354 kJ/mol 16613 kJ/mol 20117 kJ/mol 25496 kJ/mol 28932 kJ/mol 141362 kJ/mol 159076 kJ/mol

Elektronkonfiguration Kortfattet konfiguration	[Ne] 3s1
Elektronkonfiguration Fuld konfiguration	1s2 2s2 2p6 3s1
Elektronkonfigurationsdiagram	1s2 2s2 2p6 3s1
Elektroner pr. Skal	2, 8, 1
Valenselektroner	1
Valency-elektroner	1
Bohrs atommodel	Figur: Skaldiagram af Natrium (Na) atom.
Orbital diagram	1s 2s 2p 3s

Opdagelse og første isolation

Humphry Davy (1807)

Opdagelse af natrium In medieval Europe, a compound of sodium with the Latin name of sodanum was used as a headache remedy. The name sodium is thought to originate from the Arabic suda, meaning headache, as the headache-alleviating properties of sodium carbonate or soda were well known in early times. Although sodium, sometimes called soda, had long been recognized in compounds, the metal itself was not isolated until 1807 by Sir Humphry Davy through the electrolysis of sodium hydroxide. In 1809, the German physicist and chemist Ludwig Wilhelm Gilbert proposed the names Natronium for Humphry Davy's "sodium" and Kalium for Davy's "potassium". The chemical abbreviation for sodium was first published in 1814 by Jöns Jakob Berzelius in his system of atomic symbols, and is an abbreviation of the element's New Latin name natrium, which refers to the Egyptian natron, a natural mineral salt mainly consisting of hydrated sodium carbonate.

CAS Number	7440-23-5
ChemSpider ID	4514534
EC number	231-132-9
PubChem CID Number	5360545