potassium

Details

Instance of

chemical element, lithophile element, active metal

Subclass of

alkali metal, s-block

Part of

group 1, period 4, alkali metal

atomic number

19

boiling point

1038.7, 765.5

canonical SMILES

[K]

chemical formula

K

density

0.862, 0.828, 0.856

described by source

Armenian Soviet Encyclopedia, Brockhaus and Efron Encyclopedic Dictionary, Small Brockhaus and Efron Encyclopedic Dictionary, Potassium, Encyclopædia Britannica 11th edition, The New Student's Reference Work

different from

serum potassium level

discoverer or inventor

Humphry Davy

electron configuration

[Ar] 4s¹, 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹

electronegativity

0.82

element symbol

K

found in taxon

cacao, Montanoa tomentosa, Montanoa frutescens, Montanoa leucantha, Montanoa grandiflora, Artemia salina, Isaria cicadae, Hibiscus sabdariffa, Matricaria chamomilla, Equisetum telmateia, Phytelephas aequatorialis, Equisetum arvense

ionic radius

1.37, 1.38, 1.51, 1.64

mass

39.0983

melting point

336.4, 63.2

named after

potash

oxidation state

-1, 1

safety classification and labelling

NFPA 704: Standard System for the Identification of the Hazards of Materials for Emergency Response, Regulation (EC) No. 1272/2008

standard molar entropy

64.2

time of discovery or invention

1807

topic's main category

Category:Potassium

Unicode character

鉀

vapor pressure

41.70

Connected on Wikidata

Authority files