Potassium
K39.0983 g/mol Calculated
Also called K.
The metal that catches fire on water, and, as its ion, the charge that lets every nerve in your body fire. Bananas are famous for it. Element 19. Found in coffee.
Sources and notes
- The introductionfrom sourceMoleculeFinder curated
- Other namesfrom sourceWikidataIts English label and aliases on Wikidata.
- Formula and weightcomputedPubChem
- 2D drawingcomputedPubChem structure, drawn by RDKit
Where you encounter it
A pure element or an engineered material, rather than an ingredient in a product. Potassium on our curated lists, and on the product labels we hold.
Foods
Valio ValSa milk saltOn its ingredient list
Medicines
Every product and list we hold
Sources and notes
- Our curated lists and their amountsfrom sourceMoleculeFinder curatedEach amount is an editorial figure from our food and drink lists, not a measurement of any one product.
- The product labels and their strengthsfrom sourceDailyMed (FDA label)Each label lists the molecule as an ingredient, and an active ingredient at the strength shown.
- Ingredient listsfrom sourceWikidata
- How it gets therefrom sourceMoleculeFinder curatedEach mark is set by hand on our lists, never inferred; a label's ingredient is added by the maker. A row with no mark data says Not marked.
- Valio ValSa milk salt: no markfrom sourceMoleculeFinder curatedThe milk salt's composition is not confirmed, so it carries no mark.
- The line abovefrom sourceMoleculeFinder curatedFrom the group the molecule belongs to.
Properties and sources
Calculated by PubChem
- Molecular formula
- K
- Molecular weight
- 39.0983 g/mol
Reported Hazard label (GHS), ECHA, EU CLP Regulation, Safe Work Australia via PubChem
Danger Flammable pictogram (GHS02) and Corrosive pictogram (GHS05); hazard statements H260, H314, H318
Groups it belongs to
- Category
- Element & material
- Family
- Chemical elements
- Food and drink lists
- Coffee
- Elements
- Potassium
- Hazard classes
- Flammable, Corrosive, GHS Danger
- Size
- Under 100 g/mol
SMILES
[K]PubChem CID 5462222 · Wikidata Q703 · InChIKey ZLMJMSJWJFRBEC-UHFFFAOYSA-N · Data refreshed
Questions
- What is Potassium?
- The metal that catches fire on water, and, as its ion, the charge that lets every nerve in your body fire. Bananas are famous for it. Element 19. Found in coffee.
- Where is Potassium found?
- Potassium is found in coffee. from source
- How toxic is Potassium?
- Its GHS hazard label carries the signal word Danger and the hazard pictograms Flammable and Corrosive. from source
- What kind of molecule is Potassium?
- Potassium has the formula K and a molecular weight of 39.098 g/mol. MoleculeFinder files it under chemical elements, in the element & material group. from sourcefrom sourcefrom sourcefrom source
- What else is Potassium called?
- Potassium is also called K. from source
Sources and notes
- Calculated valuescomputedPubChemComputed from the structure, so no laboratory conditions apply; complexity is PubChem's own structural score.
- Hazard labelfrom sourceECHA, EU CLP Regulation, Safe Work Australia via PubChemThe label combines these classifications.
- ECHAfrom sourceAttributionSource: European Chemicals Agency, echa.europa.eu.
- EU CLP Regulationfrom sourceAttributionSource: EUR-Lex, Regulation (EC) No 1272/2008, © European Union.
- Safe Work Australiafrom sourceAttributionSource: Safe Work Australia, Hazardous Chemical Information System, © Commonwealth of Australia, CC BY 4.0.
- Data refreshedfrom sourceMoleculeFinder2026-11-09