File:Calcium_unter_Argon_Schutzgasatmosphäre.jpg · Wikimedia Commons · See Wikimedia Commons
แคลเซียม
Sign in to saveAlso known as Ca, element 20, 20Ca
Calcium is a chemical element; it has symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. It is the fifth most abundant element in Earth's crust, and the third most abundant metal, after iron and aluminium. The most common calcium compound on Earth is calcium carbonate, found in limestone and the fossils of early sea life; gypsum, anhydrite, fluorite, and apatite are also sources of calcium. The name
OverviewAI-generated
Calcium is a chemical element with the symbol Ca and atomic number 20. It has an atomic mass of 40.078 and a standard oxidation state of 2. The element was discovered in 1808. Its electron configuration is [Ar] 4s² or 1s² 2s² 2p⁶ 3s² 3p⁶ 4s². The ionic radius is 134, and its electronegativity is 1.00.
Physically, calcium has a melting point of 838.85 and a boiling point of 1483.85. It exhibits an electrical conductivity of 28200000 and a standard molar entropy of 41.6. The canonical SMILES representation is [Ca]. In Unicode, the character is "鈣".
In scientific literature, the term "calcium" appears in 713,024 PubMed records. It is referenced by 4,896 other encyclopedia articles. PubChem lists its weight as 40.08 and its charge as 0. It has zero hydrogen bond donors and acceptors, with a topological polar surface area of 0.
Synthesized by Vinony from 29 facts across 4 sources: Wikidata, PubMed, PubChem, Vinony graph. Generated from structured data (not the Wikipedia text) and checked against those facts — may still contain errors.
In the Vinony graph
Within Vinony's link graph, แคลเซียม is referenced by 4,896 other articles, and connects out to block, cubic crystal system and beta decay.
Vinony files it under Alkaline earth metals, Calcium and Chembox container only.
Its subject is documented across 179 Wikipedia language editions.
Key facts
- Calcium.engvar
- en-GB
via Wikipedia infobox
Chemical data
- Formula
- Ca
- Molecular weight
- 40.08 g/mol
- IUPAC name
- calcium
- SMILES
- [Ca]
- InChIKey
- OYPRJOBELJOOCE-UHFFFAOYSA-N
- Polar surface area
- 0 Ų
- H-bond donors
- 0
- H-bond acceptors
- 0
- Formal charge
- 0
via PubChem
Research
713,024 papers- Calcium Absorption from Food Products: Food Matrix Effects.Nutrients · 2021
- Calcium's Role and Signaling in Aging Muscle, Cellular Senescence, and Mineral Interactions.International journal of molecular sciences · 2023
- Calcium's Role in Orchestrating Cancer Apoptosis: Mitochondrial-Centric Perspective.International journal of molecular sciences · 2023
- Ionized calcium.Clinica chimica acta; international journal of clinical chemistry · 2011
- The Significance of Calcium in Photosynthesis.International journal of molecular sciences · 2019
via PubMed
Wikidata facts
- Subclass of
- alkaline earth metal
- Part of
- alkaline earth metal
- Named after
- lime
- Mass
- 40.078
- Image
- Calcium 1.jpg
- Has use
- essential medicine
Show 20 more facts
- subject has role
- essential medicine
- melting point
- 838.85
- boiling point
- 1483.85
- atomic number
- 20
- Commons category
- Calcium
- topic's main category
- Category:Calcium
- oxidation state
- 2
- element symbol
- Ca
- discoverer or inventor
- Humphry Davy
- Commons gallery
- Calcium
- canonical SMILES
- [Ca]
- chemical formula
- Ca
- time of discovery or invention
- 1808-00-00
- standard molar entropy
- 41.6
- electrical conductivity
- 28200000
- Unicode character
- 鈣
- electronegativity
- 1.00
- electron configuration
- 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²
- ionic radius
- 134
- on focus list of Wikimedia project
- Wikipedia:Vital articles/Level/4
Sources (9)
via Wikidata · CC0
Gallery (20)
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