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francium
Chemical element with symbol Fr and atomic number 87
Also known as element 87 · Fr · eka-cesium · catium · eka-caesium · 87Fr
- Symbol
- Fr
- Atomic number
- 87
- Mass
- 223.0197 Da
1
Sources- 1.physics.nist.gov/cgi-bin/Compositions/stand_alone.pl?ele=&ascii=ascii2&isotype=allRetrieved 2026-09-19
- 223.0197 Da
- Melting point
- 300 K
- Discovered by
- Discovered
- 1939
Overview
All data
98 statements · 22% with external sources · numbers in brackets are citations
- Subclass of
- alkali metal follows: caesium
- s-block
- Canonical SMILES
- [Fr]
1
- [Fr]
- Formula
- Fr
1
- Fr
- Ionic radius
- 1.8 ångström charge number: 1 · coordination number: 6
- Electron configuration
- [Rn] 7s¹
- Thermal conductivity
- 15 watt per metre kelvin
- Ionization energy
- 4.0727 eV
1
Sources- 1.“NIST Atomic Spectra Database, Ionization Energies”physics.nist.gov/asdRetrieved 2026-09-18
- 4.0727 eV
- IPA transcription
- ˈfrænsiəm language: English
- Covalent radius
- 260 picometre
On other databases
53 identifiers linking francium across the web's reference databases
- Arabic Ontology lexical concept ID151078463
- Australian Educational Vocabulary IDscot/3521
- BabelNet ID00006919n
- BNCF Thesaurus ID75387
- Brockhaus Enzyklopädie online IDfrancium
- CAS Registry Number7440-73-5
- ChEBI ID33323
- ChemSpider ID4886484
- Dewey Decimal Classification546.386
- DSSTOX compound identifierDTXCID20147885
- DSSTox substance IDDTXSID20225394
- Elhuyar ZTH ID024312
- Encyclopædia Britannica Online IDscience/francium
- Encyclopædia Universalis IDfrancium
- Encyclopedia of China (Third Edition) ID (2026)2jWjRV
- Encyclopedia of China (Third Edition) old ID (2021)184929
- Freebase ID/m/025rqcb
- Gmelin number40458
- GND ID4155153-9
- Gran Enciclopèdia Catalana IDfranci
- Gran Enciclopèdia Catalana ID (former scheme)0110219
- Great Norwegian Encyclopedia IDfrancium
- Great Russian Encyclopedia portal IDfrantsii-4bce1f
- Hrvatska enciklopedija IDfrancij
- Human Metabolome Database IDHMDB0303046
- InChIInChI=1S/Fr
- InChIKeyKLMCZVJOEAUDNE-UHFFFAOYSA-N
- Interlingual Index IDi113934
- J9U entity ID987007550763805171
- KBpedia IDFrancium
- Lex IDfrancium
- Library of Congress Authorities IDsh85051541
- MeSH descriptor IDD005605
- MeSH tree codeD01.268.271.380
- Microsoft Academic ID (discontinued)528649303
- Namuwiki ID프랑슘
- NE.se IDfrancium
- NicoNicoPedia word article IDフランシウム
- OmegaWiki Defined Meaning159016
- PSH ID5749
- PubChem CID6328145
- Quora topic IDFrancium
- ScienceDirect topic IDphysics-and-astronomy/francium
- SureChEMBL ID29353787
- Treccani IDfrancio
- UMLS CUIC0016678
- UniChem compound ID27202533
- UNII15TEQ7D2QF
- USGS Thesaurus ID1457
- Vikidia article IDfr:Francium
- WikiKids IDFrancium
- WordNet 3.1 Synset ID14662042-n
- Yale LUX IDconcept/369a50f5-59a6-42dc-a854-3667b943aed6