Calcium (Ca)

Calcium is the 20th element in the periodic table and has a symbol of Ca and atomic number of 20. It has an atomic weight of 40.078 and a mass number of 40. Calcium has twenty protons and twenty neutrons in its nucleus, and twenty electrons in four shells. It is located in group two, period four and block s of the periodic table. Soft grey metallic element belonging to group 2 of the periodic table. Used a reducing agent in the extraction of thorium, zirconium and uranium. Essential element for living organisms.

Atomic Number	20
Atomic Weight	40.078
Mass Number	40

Group	2
Period	4
Block	s

Protons	20 p⁺
Neutrons	20 n⁰
Electrons	20 e^-

Physical Properties

Atomic Radius	180 pm 270 pm
Molar Volume	29.9 cm³/mol
Covalent Radius	171 pm 147 pm 133 pm 170 pm 176 pm
Metallic Radius	174 pm 197 pm
Ionic Radius	100 pm 106 pm 112 pm 118 pm 123 pm 134 pm
Crystal Radius	114 pm 120 pm 126 pm 132 pm 137 pm 148 pm
Van der Waals Radius	240 pm 231 pm 281 pm 231 pm 339.9 pm
Density	1.54 g/cm³ 1,378 kg/m³

Chemical Properties

Energy

Proton Affinity
Electron Affinity	0.02455 eV/particle
Ionization Energy	6.1131552 eV/particle 11.871718 eV/particle 50.91315 eV/particle 67.2732 eV/particle 84.338 eV/particle 108.78 eV/particle 127.2 eV/particle 147.24 eV/particle 188.535 eV/particle 211.2751 eV/particle 591.6 eV/particle 658.24 eV/particle 728.6 eV/particle 817.22 eV/particle 893.98 eV/particle 973.7 eV/particle 1,086.8 eV/particle 1,157.726 eV/particle 5,128.8576 eV/particle 5,469.8614 eV/particle

Heat of Vaporization	153.6 kJ/mol
Heat of Fusion	9.2 kJ/mol
Heat of Formation	177.8 kJ/mol
Electrons

Electron Shells	2, 8, 8, 2

Valence Electrons	2 ⓘ

Electron Configuration	[Ar] 4s²ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

Oxidation States	1, 2
Electronegativity	6.113 eV/particle 0.1154119 1
Electrophilicity Index	0.7734001442996138 eV/particle
States of Matter

Phase	Solid
Gas Phase
Boiling Point	1,757.15 K
Melting Point	1,115.15 K
Critical Pressure
Critical Temperature
Triple Point
Visual
Calcium is a Silver. Ca has a CPK of #808090, Jmol of #3dff00, and MOLCAS GV of #3dff00.
Color	Silver #808090 #3dff00 #3dff00
Appearance
Refractive Index
Thermodynamic Properties
Thermal Conductivity
Thermal Expansion	0.0000223 1/K
Molar Heat Capacity	25.929 J/(mol K)
Specific Heat Capacity	0.647 J/(g⋅K)
Heat Capacity Ratio (Adiabatic Index)
Electrical Properties
Type	Conductor
Electrical Conductivity	29 MS/m
Electrical Resistivity	0.00000003399999999999 m Ω
Superconducting Point
Magnetism
Type	paramagnetic
Magnetic Susceptibility (Mass)	0.0000000138 m³/Kg
Magnetic Susceptibility (Molar)	0.0000000005531 m³/mol
Magnetic Susceptibility (Volume)	0.00002139
Magnetic Ordering
Curie Point
Neel Point
Structure
The Crystal Structure of Calcium is FCC. The lattice constant of Ca is 5.58 Å. The lattice angles of Element 20 are π/2, π/2, π/2.
Crystal Structure	Face Centered Cubic (FCC)
Lattice Constant	5.58 Å
Lattice Angles	π/2, π/2, π/2
Mechanical Properties
Calcium has a Brinell of 167 MPa, and Mohs hardness of 1.75 MPa. The Bulk Modulus of Ca is 17 GPa. The Shear Modulus of Element 20 is 7.4 GPa. The Young Modulus of Calcium (Ca) is 20 GPa. The Poisson Ratio of Calcium is 0.31. The Speed of Sound of Ca is 3810 m/s.
Hardness	167 MPa 1.75 MPa
Bulk Modulus	17 GPa
Shear Modulus	7.4 GPa
Young's Modulus	20 GPa
Poisson Ratio	0.31
Speed of Sound	3,810 m/s
Classification
The CAS Group of Calcium is IIA. The IUPAC Group of Ca is IIA. The Glawe Number of Element 20 is 16. The Mendeleev Number of Calcium (Ca) is 7. The Pettifor Number of Calcium is 16. The Geochemical Class of Ca is major. The Goldschmidt Class of Element 20 is litophile.
Category	Alkaline earth metals, Alkaline earth metals
CAS Group	IIA
IUPAC Group	IIA
Glawe Number	16
Mendeleev Number	7
Pettifor Number	16
Geochemical Class	major
Goldschmidt Class	litophile

Other

The Dipole Polarizability of Calcium is 160.8 plus or minus 4 a₀. Ca has a C6 Dispersion Coefficient (CD) of 2163 a₀, and C6 Dispersion Coefficient (GB) of 2230 a₀. The Allotropes of Element 20 is . The Neutron Cross Section of Calcium (Ca) is 0.43. The Neutron Mass Absorption of Calcium is 0.00037. The Quantum Numbers of Ca is 1S0. The Space Group of Element 20 is 225 (Fm_3m).

Gas Basicity
Dipole Polarizability	160.8 ± 4 a₀
C6 Dispersion Coefficient	2,163 a₀ 2,230 a₀
Allotropes
Neutron Cross Section	0.43
Neutron Mass Absorption	0.00037
Quantum Numbers	1S0
Space Group	225 (Fm_3m)

Isotopes of Calcium

Stable Isotopes	3
Unstable Isotopes	26
Natural Isotopes	6

³³Ca

Mass Number	33
Neutron Number	13
Relative Atomic Mass	33.033312 ± 0.000429 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin	5/2
Quadrupole Moment
Discovery Year
Parity	+

Decay Mode	Intensity
p (proton emission)

³⁴Ca

Mass Number	34
Neutron Number	14
Relative Atomic Mass	34.015985 ± 0.000322 Da
G-Factor	0
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin	0
Quadrupole Moment	0
Discovery Year
Parity	+

Decay Mode	Intensity
2p (2-proton emission)

³⁵Ca

Mass Number	35
Neutron Number	15
Relative Atomic Mass	35.005572 ± 0.000215 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	25.7 ± 0.2 ms
Spin	1/2
Quadrupole Moment	0
Discovery Year	1985
Parity	+

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	95.8%
2p (2-proton emission)	4.2%

³⁶Ca

Mass Number	36
Neutron Number	16
Relative Atomic Mass	35.993074388 ± 0.000042941 Da
G-Factor	0
Abundance
Radioactivity	☢️ Radioactive
Half Life	100.9 ± 1.3 ms
Spin	0
Quadrupole Moment	0
Discovery Year	1977
Parity	+

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	51.2%

³⁷Ca

Mass Number	37
Neutron Number	17
Relative Atomic Mass	36.985897849 ± 0.00000068 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	181 ± 0.9 ms
Spin	3/2
Quadrupole Moment
Discovery Year	1964
Parity	+

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	76.8%

³⁸Ca

Mass Number	38
Neutron Number	18
Relative Atomic Mass	37.976319223 ± 0.000000208 Da
G-Factor	0
Abundance
Radioactivity	☢️ Radioactive
Half Life	443.7 ± 0.25 ms
Spin	0
Quadrupole Moment	0
Discovery Year	1966
Parity	+

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

³⁹Ca

Mass Number	39
Neutron Number	19
Relative Atomic Mass	38.970710811 ± 0.00000064 Da
G-Factor	0.68093333333333 ± 0.00010666666666667
Abundance
Radioactivity	☢️ Radioactive
Half Life	860.3 ± 0.8 ms
Spin	3/2
Quadrupole Moment	0.038 ± 0.003
Discovery Year	1943
Parity	+

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

⁴⁰Ca

Mass Number	40
Neutron Number	20
Relative Atomic Mass	39.96259085 ± 0.000000022 Da
G-Factor	0
Abundance	96.941 ± 0.156
Radioactivity	☢️ Radioactive
Half Life
Spin	0
Quadrupole Moment	0
Discovery Year	1922
Parity	+

Decay Mode	Intensity
2β⁺ (double β⁺ decay)

⁴¹Ca

Mass Number	41
Neutron Number	21
Relative Atomic Mass	40.962277905 ± 0.000000147 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	99.4 ± 1.5 ky
Spin	7/2
Quadrupole Moment	-0.0665 ± 0.0018
Discovery Year	1939
Parity	-

Decay Mode	Intensity
ϵ (electron capture)	100%

⁴²Ca

Mass Number	42
Neutron Number	22
Relative Atomic Mass	41.95861778 ± 0.000000159 Da
G-Factor	0
Abundance	0.647 ± 0.023
Radioactivity	Stable
Half Life	Not Radioactive ☢️
Spin	0
Quadrupole Moment	0
Discovery Year	1934
Parity	+

⁴³Ca

Mass Number	43
Neutron Number	23
Relative Atomic Mass	42.958766381 ± 0.000000244 Da
G-Factor	-0.37638 ± 0.000017142857142857
Abundance	0.135 ± 0.01
Radioactivity	Stable
Half Life	Not Radioactive ☢️
Spin	7/2
Quadrupole Moment	-0.0408 ± 0.0008
Discovery Year	1934
Parity	-

⁴⁴Ca

Mass Number	44
Neutron Number	24
Relative Atomic Mass	43.955481489 ± 0.000000348 Da
G-Factor	0
Abundance	2.086 ± 0.11
Radioactivity	Stable
Half Life	Not Radioactive ☢️
Spin	0
Quadrupole Moment	0
Discovery Year	1922
Parity	+

⁴⁵Ca

Mass Number	45
Neutron Number	25
Relative Atomic Mass	44.95618627 ± 0.000000392 Da
G-Factor	-0.37897142857143 ± 0.00037142857142857
Abundance
Radioactivity	☢️ Radioactive
Half Life	162.61 ± 0.09 d
Spin	7/2
Quadrupole Moment	0.038 ± 0.012
Discovery Year	1940
Parity	-

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

⁴⁶Ca

Mass Number	46
Neutron Number	26
Relative Atomic Mass	45.953687726 ± 0.000002398 Da
G-Factor	0
Abundance	0.004 ± 0.003
Radioactivity	☢️ Radioactive
Half Life
Spin	0
Quadrupole Moment	0
Discovery Year	1938
Parity	+

Decay Mode	Intensity
2β⁻ (double β⁻ decay)

⁴⁷Ca

Mass Number	47
Neutron Number	27
Relative Atomic Mass	46.954541134 ± 0.000002384 Da
G-Factor	-0.40182857142857 ± 0.00031428571428571
Abundance
Radioactivity	☢️ Radioactive
Half Life	4.536 ± 0.003 d
Spin	7/2
Quadrupole Moment	0.084 ± 0.006
Discovery Year	1951
Parity	-

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

⁴⁸Ca

Mass Number	48
Neutron Number	28
Relative Atomic Mass	47.952522654 ± 0.000000018 Da
G-Factor	0
Abundance	0.187 ± 0.021
Radioactivity	☢️ Radioactive
Half Life	56 ± 10 Ey
Spin	0
Quadrupole Moment	0
Discovery Year	1938
Parity	+

Decay Mode	Intensity
2β⁻ (double β⁻ decay)
β⁻ (β⁻ decay)

⁴⁹Ca

Mass Number	49
Neutron Number	29
Relative Atomic Mass	48.955662625 ± 0.00000019 Da
G-Factor	-0.91993333333333 ± 0.00053333333333333
Abundance
Radioactivity	☢️ Radioactive
Half Life	8.718 ± 0.006 m
Spin	3/2
Quadrupole Moment	-0.036 ± 0.003
Discovery Year	1950
Parity	-

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

⁵⁰Ca

Mass Number	50
Neutron Number	30
Relative Atomic Mass	49.957499215 ± 0.0000017 Da
G-Factor	0
Abundance
Radioactivity	☢️ Radioactive
Half Life	13.45 ± 0.05 s
Spin	0
Quadrupole Moment	0
Discovery Year	1964
Parity	+

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

⁵¹Ca

Mass Number	51
Neutron Number	31
Relative Atomic Mass	50.960995663 ± 0.00000056 Da
G-Factor	-0.69973333333333 ± 0.00073333333333333
Abundance
Radioactivity	☢️ Radioactive
Half Life	10 ± 0.8 s
Spin	3/2
Quadrupole Moment	0.036 ± 0.012
Discovery Year	1980
Parity	-

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)

⁵²Ca

Mass Number	52
Neutron Number	32
Relative Atomic Mass	51.963213646 ± 0.00000072 Da
G-Factor	0
Abundance
Radioactivity	☢️ Radioactive
Half Life	4.6 ± 0.3 s
Spin	0
Quadrupole Moment	0
Discovery Year	1985
Parity	+

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	2%

⁵³Ca

Mass Number	53
Neutron Number	33
Relative Atomic Mass	52.968451 ± 0.000047 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	461 ± 90 ms
Spin	1/2
Quadrupole Moment	0
Discovery Year	1983
Parity	-

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	40%

⁵⁴Ca

Mass Number	54
Neutron Number	34
Relative Atomic Mass	53.972989 ± 0.000052 Da
G-Factor	0
Abundance
Radioactivity	☢️ Radioactive
Half Life	90 ± 6 ms
Spin	0
Quadrupole Moment	0
Discovery Year	1997
Parity	+

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

⁵⁵Ca

Mass Number	55
Neutron Number	35
Relative Atomic Mass	54.979978 ± 0.000172 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	22 ± 2 ms
Spin	5/2
Quadrupole Moment
Discovery Year	1997
Parity	-

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

⁵⁶Ca

Mass Number	56
Neutron Number	36
Relative Atomic Mass	55.985496 ± 0.000268 Da
G-Factor	0
Abundance
Radioactivity	☢️ Radioactive
Half Life	11 ± 2 ms
Spin	0
Quadrupole Moment	0
Discovery Year	1997
Parity	+

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

⁵⁷Ca

Mass Number	57
Neutron Number	37
Relative Atomic Mass	56.992958 ± 0.000429 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin	5/2
Quadrupole Moment
Discovery Year	2009
Parity	-

Decay Mode	Intensity
β⁻ (β⁻ decay)
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

⁵⁸Ca

Mass Number	58
Neutron Number	38
Relative Atomic Mass	57.998357 ± 0.000537 Da
G-Factor	0
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin	0
Quadrupole Moment	0
Discovery Year	2009
Parity	+

Decay Mode	Intensity
β⁻ (β⁻ decay)
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

⁵⁹Ca

Mass Number	59
Neutron Number	39
Relative Atomic Mass	59.006237 ± 0.000644 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin	5/2
Quadrupole Moment
Discovery Year	2018
Parity	-

Decay Mode	Intensity
β⁻ (β⁻ decay)
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

⁶⁰Ca

Mass Number	60
Neutron Number	40
Relative Atomic Mass	60.011809 ± 0.000751 Da
G-Factor	0
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin	0
Quadrupole Moment	0
Discovery Year	2018
Parity	+

Decay Mode	Intensity
β⁻ (β⁻ decay)
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

⁶¹Ca

Mass Number	61
Neutron Number	41
Relative Atomic Mass	61.020408 ± 0.000859 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin	1/2
Quadrupole Moment	0
Discovery Year
Parity	-

Decay Mode	Intensity
β⁻ (β⁻ decay)
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

History

Calcium was known as early as the first century when the Ancient Romans prepared lime as calcium oxide. Calcium was first isolated by Sir Humphry Davy in 1808 when he electrolyzed a mixture of lime and mercuric oxide. Davy was trying to isolate calcium; when he heard that Jöns Jakob Berzelius and Pontin prepared calcium amalgam by electrolyzing lime in mercury, he tried it himself. From the Latin word calx, lime

Discoverers	Sir Humphrey Davy
Discovery Location	England
Discovery Year	1808
Etymology (Name Origin)	Latin: calx, calcis (lime).
Pronunciation	KAL-si-em (English)

Calcium is considered to be non-toxic

The shell of an egg is made up of primarily calcium carbonate

Uses

Calcium is used to remove oxygen, sulfur and carbon from alloys. It is also used as an alloying agent used in the production of aluminum, beryllium, copper, lead, and magnesium alloys. Calcium is used as a reducing agent in the extraction of other metals, such as uranium, zirconium, and thorium. Calcium carbonate is used in manufacturing cement and mortar, lime and limestone. Used by many forms of life to make shells and bones. Virtually no use for the pure metal, however two of its compounds are, lime (CaO) and gypsum (CaSO4), are in great demand by a number of industries.

Sources

Obtained from minerals like chalk, limestone & marble. Pure metal is produced by replacing the calcium in lime (calcium carbonate, CaCO3) with aluminium in hot, low pressure retorts.

Abundance
Abundance in Earth's crust	41,500 mg/kg
Natural Abundance (Oceans)	412 mg/L
Natural Abundance (Human Body)	1.4 %
Natural Abundance (Meteor)	1.1 %
Natural Abundance (Sun)	0.007 %
Abundance in Universe	0.007 %

Nuclear Screening Constants

1	s	0.527
2	p	3.9586
2	s	6.2236
3	p	11.3417
3	s	10.3985
4	s	15.602

Also Known As

Ca
element 20
20Ca

Translations

Italiancalcio
Norwegian Bokmålkalsium
Frenchcalcium
Russianкальций
GermanCalcium
Polishwapń
Dutchcalcium
Spanishcalcio
Chinese (Traditional)鈣
Afrikaanskalsium
Amharicካልሲየም
AragoneseCalcio
Arabicكالسيوم
AsturianCalciu
AzerbaijaniKalsium
BashkirКальций
BelarusianКальцый
Bulgarianкалций
Banglaক্যালসিয়াম
BretonKalsiom
Bosniankalcij
Catalancalci
CherokeeᎪᎳ ᏗᏝᏂᎪᎯᏍᏗᏍᎩ
Central Kurdishکالسیۆم
Corsicancalciu
Czechvápník
ChuvashКальци
WelshCalsiwm
Danishcalcium
Divehiކެލްސިއަމް
Greekασβέστιο
Esperantokalcio
Estoniankaltsium
Basquekaltzio
Persianکلسیم
Finnishkalsium
Northern FrisianKaltsium
FriulianCalci
IrishCailciam
GalicianCalcio
Manxkelkium
Hakka ChineseKoi
HawaiianKalipuna
Hebrewסידן
Hindiकैल्शियम
Fiji HindiCalcium
Croatiankalcij
Haitian CreoleKalsyòm
Hungariankalcium
Armenianկալցիում
Interlinguacalcium
Indonesiankalsium
Idokalcio
Icelandickalsín
Japaneseカルシウム
Lojbanbogjinme
JavaneseKalsium
Georgianკალციუმი
KazakhКальций
Kannadaಕ್ಯಾಲ್ಶಿಯಮ್
Korean칼슘
KurdishKalsiyûm
KomiКальций
Latincalcium
LuxembourgishKalzium
LigurianCäso
Lithuaniankalcis
Latviankalcijs
Māorikonupūmā
MacedonianКалциум
Malayalamകാൽ സ്യം
Mongolianкальци
Marathiकॅल्शियम
Western MariКальций
Malaykalsium
Burmeseကယ်လဆီယမ်
nahTenextepoztli
Low GermanCalcium
Nepaliक्याल्सियम
Norwegian Nynorskkalsium
NavajoKáálsiiyin
OccitanCalci
Punjabiਕੈਲਸ਼ੀਅਮ
PiedmonteseCàuss
Western Panjabiکیلشیم
Portuguesecálcio
QuechuaIsku q'illay
Romaniancalciu
YakutКалсиум
Siciliancauciu
Serbo-CroatianKalcij
Sinhalaකැල්සියම්
Slovakvápnik
Sloveniankalcij
AlbanianKalciumi
Serbianкалцијум
Saterland FrisianCalcium
SundaneseKalsium
Swedishkalcium
SwahiliKalisi
Tamilகல்சியம்
Teluguకాల్షియమ్
TajikКалсий
Thaiแคลเซียม
TagalogKalsiyo
TurkishKalsiyum
Uyghurكالتىسىي
Ukrainianкальцій
Urduجمصر
UzbekKalsiy
VepsKal'cii
Vietnamesecanxi
WarayCalsyo
KalmykКалцион
Yiddishקאלציום
YorubaCalcium
Chinese鈣
German (Switzerland)Calcium
English (Canada)Calcium
English (United Kingdom)calcium
Portuguese (Brazil)cálcio
CebuanoKalsiyum
Cantonese鈣
Gujaratiકેલ્શિયમ
Odiaକ୍ୟାଲ୍‌ସିଅମ
Scotscalcium
GuaraniItakairã
Tatarкәлси
BavarianCalcium
KikuyuCalcium
Literary Chinese鈣
Belarusian (Taraskievica orthography)Вапень
Min Nan ChineseKhā-lú-siúm
Newariक्याल्सियम
LombardCàls
SomaliKaalshiyaam
KyrgyzКальций
LimburgishCalcium
cdoGái
FaroeseKalsium
Sanskritक्याल्सियम
Scottish GaelicCalcium
Maltesekalċju
Gan Chinese鈣
AromanianCalciu
Paliक्याल्सियम
ExtremaduranCalciu
Tibetanདཀར་ཤམ།
Bhojpuriकैल्सियम
oloKal’cii
azbکلسیوم
Lingua Franca Novacalsio
Wu Chinese钙
kbpKalɩsɩyɔm
Sindhiڪيلشم
Pashtoکلسيم
Chinese (Taiwan)鈣
Chinese (Simplified)钙
SardinianCàlciu
Moroccan Arabicكالسيوم
Egyptian Arabicكالسيوم
FijianCalcium
WalloonCalciom
CornishKalciom
BikolKalsyo
BalineseKalsium
Chinese (Hong Kong SAR China)鈣
Inuktitutᓴᐅᓂᒃᓴᖅ
GandaKalusiyaamu
Korean (North Korea)칼시움
blkကယ်လသီယမ်
Malay (Arabic)کلسيوم
ShonaRondongu
ZuluUmCaphana

Calcium on ChemicalAid

AGROVOC ID	c_1196
Art & Architecture Thesaurus ID	300264232
Australian Educational Vocabulary ID	scot/3064
BNCF Thesaurus ID	8953
Basque Vikidia ID	Kaltzio
Biblioteca Nacional de España ID	XX531346
Bibliothèque nationale de France ID	11976285h
Brockhaus Enzyklopädie online ID	calcium-20
CAS Registry Number	7440-70-2
ChEBI ID	22984
ChemSpider ID	4573905
DSSTOX compound identifier	DTXCID40876145
DSSTox substance ID	DTXSID9050484
Den Store Danske ID	calcium
DrugBank ID	01373
ECHA Substance Infocard ID	100.028.344
Encyclopedia of China ID (Second Edition)	203125
Encyclopædia Britannica Online ID	science/calcium
Encyclopædia Britannica Online ID	science/calcium-ion
Encyclopædia Universalis ID	calcium
EuroVoc ID	5304
Freebase ID	/m/025tkqy
French Vikidia ID	Calcium
GND ID	4069806-3
Golden ID	Calcium-JG5E
Gran Enciclopèdia Catalana ID	0087196
Gran Enciclopèdia Catalana ID	0013023
Great Russian Encyclopedia Online ID	2037432
HSDB ID	273
ICSC ID	1192
InChI	InChI=1S/Ca
InChIKey	OYPRJOBELJOOCE-UHFFFAOYSA-N
KBpedia ID	Calcium
KEGG ID	C00076
Krugosvet article	nauka_i_tehnika/himiya/KALTSI.html
Latvian National Encyclopedia Online ID	139701
Library of Congress authority ID	sh85018768
MeSH descriptor ID	D002118
NALT ID	6421
NDF-RT ID	N0000146031
NDL Authority ID	00565069
NE.se ID	kalcium
NKCR AUT ID	ph116664
Namuwiki ID	칼슘
National Library of Israel J9U ID	987007293780405171
New York Times topic ID	subject/calcium
OmegaWiki Defined Meaning	471
OpenAlex ID	C2910173204
OpenAlex ID	C519063684
PSH ID	5752
PatientsLikeMe treatment ID	calcium
Probes And Drugs ID	PD051696
PubChem CID	5460341
Quora topic ID	Calcium
RxNorm ID	1895
Spanish Vikidia ID	Calcio
Store medisinske leksikon ID	kalsium
Store medisinske leksikon ID	kalsium_-_fysiologi
Store norske leksikon ID	kalsium
Treccani ID	calcio
UK Archival Thesaurus ID	f2/mt225/4347/702
UK Parliament thesaurus ID	8918
UMLS CUI	C0006675
UNESCO Thesaurus ID	concept4508
UNII	SY7Q814VUP
USGS Thesaurus ID	1418
WordNet 3.1 Synset ID	14656826-n
YSO ID	1852
ZVG number	8160
Zhihu topic ID	19668568

Calcium (Ca)

Physical Properties

Chemical Properties

Other

Isotopes of Calcium

33Ca

34Ca

35Ca

36Ca

37Ca

38Ca

39Ca

40Ca

41Ca

42Ca

43Ca

44Ca

45Ca

46Ca

47Ca

48Ca

49Ca

50Ca

51Ca

52Ca

53Ca

54Ca

55Ca

56Ca

57Ca

58Ca

59Ca

60Ca

61Ca