19 39.098
K
Potassium

Potassium , K

Potassium, an essential alkali metal with the symbol K (Arabic: al qalja‎ → Latin: kalium) and atomic number 19, stands as a fundamental element contributing to various aspects of life and industry. The name "potassium" comes from the word "potash", as potassium was first isolated from potash. Potassium is a soft silvery-white metallic alkali metal that occurs naturally bound to other elements in seawater and many minerals. It is part of group 1 in the periodic table, showcasing both reactive and versatile properties.

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P4-5001-M

KF Pellets Potassium fluoride

P4-10000-P

K2B4O7-xH2O (tetra) -6 mesh 99.9% Pure

Potassium Borate

P4-10003-P

K2CO3 -10 mesh 99.999% Pure

Potassium Carbonate

8 UN1759 PG III

P4-10004-P

K2CO3 -50mesh 99.9% Pure

Potassium Carbonate

P4-10005-P

KCl Powder-30 Mesh 99.999% Pure

Potassium Chloride

P4-10006-P

HF -60 mesh 99.99% Pure

Potassium fluoride

6.1 UN1812 PG III

P4-10007-P

KSbF6 -6 mesh 99.9% Pure

Potassium Fluoroantimonate

8 UN1759 PG II

P4-10008-P

KIO3 -80 mesh 99.9% Pure

Potassium Iodate

P4-10011-P

K2MoO4 -200 mesh 99.9% Pure

Potassium Molybate

P4-10012-P

KNbO3 -100 mesh 99.9% Pure

Potassium Niobate

P4-10013-P

KIO4 -40 mesh 99.9% Pure

Potassium Periodate

P4-10014-P

KReO4 -40 mesh 99.9% Pure

Potassium Perrhenate

P4-10015-P

K2S2O8 -100 mesh 99.9% Pure

Potassium Persulphate

P4-10016-P

K2SeO4 -100 mesh 99.5% Pure

Potassium Selenate

P4-10017-P

K2SeO3 -100 mesh 99.5% Pure

Potassium Selenite

P4-10019-P

KTaO3 -100 mesh 99.9% Pure

Potassium Tantalate

P4-10020-P

K2TeO3 -100 mesh 99.5% Pure

Potassium Telluride

6.1 UN3288 PG III

P4-10021-P

K2WO4 -100 mesh 99.95% Pure

Potassium Tungstate

P4-10022-P

KVO3 (meta) -200 mesh 99.9% Pure

Potassium Vanadate

6.1 UN2864 PG 11

P4-10023-P

K3VO4 (ortho)-200 mesh 99.9% Pure

Potassium Vanadate

6.1 UN2864 PG 11

P4-10024-P

K4V2O7 (pyro) -200 mesh 99.9% Pure

Potassium Vanadate

6.1 UN2864 PG 11

P4-10025-P

K2ZrO3 -200 mesh 99.5% Pure

Potassium Zirconate

P4-10026-P

K2MoO4 -20 mesh 99% Pure

Potassium Molybate

P4-9001-D

Potassium/Sodium Niobate, (K1.5Na1.5)NbO3,

Purity 99.5%

P4-9002-D

Potassium Tantalate KTaO3,

Available purity 99.9% & 99.99%

P4-9003-D

Potassium Tantalum Niobium oxide KTaNbO,

Available in various ratios wt% or at%, Purity 99.9%

P4-9004-D

Potassium Sodium Niobium oxide Barium Zirconate KNaNbO:BaZrO,

Available in various ratios wt% or at%, Purity 99.9%

P4-9005-D

Potassium Niobium oxide KNbO3,

Purity 99.9%

P4-9006-D

Potassium Cobalt oxide K1Co1O2,

Purity 99.9%

P4-9007-D

Potassium Chloride, KCl,

Purity 99.99%

P4-9008-D

Potassium Sodium Niobium oxide KNaNbO,

Available in various ratios wt% or at%, Purity 99.9%

P4-9002-D5

KTaO3 TRG 101.6mm dia. x 3mm Tk 99.9% Pure

Potassium tantalate 

CRY-KBr

Potassium bromide, KBr single crystal

More Info
CRY-KCl

Potassium Chloride Single Crystal Substrate

More Info
CRY-KTaO3

KTaO3 single crystal substrate/wafer

More Info

Abundant in nature, potassium plays a crucial role in biological systems, being an essential nutrient for plants, animals, and humans alike. As a key component in the regulation of cellular activities, potassium maintains proper fluid balance, nerve impulses, and muscle contractions. In plants, it supports growth and overall health, making potassium a cornerstone in agricultural fertilisers to enhance crop yields. 

Beyond its biological significance, potassium finds applications in diverse industrial sectors. Potassium compounds, such as potassium hydroxide (KOH), contribute to the production of soaps, detergents, and various chemicals. Potassium carbonate is employed in the manufacturing of glass, while potassium nitrate is a component in fertilisers and fireworks. Additionally, potassium's role in certain alloys enhances their properties for specialised applications.

Potassium's reactivity with water is notable, producing potassium hydroxide and hydrogen gas. Due to its highly reactive nature, potassium is often stored in mineral oil to prevent undesired reactions with atmospheric moisture. In many respects, potassium and sodium are chemically similar, although organisms in general, and animal cells in particular, treat them very differently.

Symbol K
Atomic number 19
No. of naturally occurring isotopes 2+1*
Atomic weight 39.0983
Electronic configuration [Ar]4s1
Metal radius/pm 227
Ionic radius(6-coordinate)/pm 138
Eo(M+(aq)+e- →M(S))/V -2.925
Density (20°C)/gcm3 0.856
Melting point /°C 63.2
Boiling point /°C 765.5
ΔHfus/kJmol-1 2.39
ΔHvap/kJmol-1 79
ΔHf(monoatomic gas)/kJmol-1 90
ΔH(dissoc)/kJmol-1 49.9
Ionization energy/kJmol-1 418.6
*(radioactive 4°K t1/2 1.27 x 109 y)
Temperature (oC) @Vap. Pressure
10-8 Torr 842
10-6 Torr 992
10-4 Torr 1192
Techniques
Electron Beam Excellent
Crucible Al2O3
Coil Tungsten
Boat Tungsten
Remarks
Alloys with refractory metals; rapid Evaporation suggested. Spits in EB.