Calci

Calci (Ca)

chemical element with symbol Ca and atomic number 20
Atomic Number20
Atomic Weight40.078
Rhif màs40
Group2
Period4
Blocks
Proton20 p+
Niwtron20 n0
Electron20 e-
Animated Bohr model of Ca (Calci)

Nodwedd Ffisegol

Atomic Radius
180 pm
molar volume
covalent radius
171 pm
Metallic Radius
174 pm
ionic radius
100 pm
Crystal Radius
114 pm
Van der Waals radius
231 pm
density
1.54 g/cm³
Atomic Radii Of The Elements: Calci0153045607590105120135150165180195210225240pmAtomic RadiusCovalent RadiusMetallic RadiusVan der Waals radius

Nodwedd Gemegol

egni
proton affinity
electron affinity
0.02455 eV/particle
ionization energy
6.1131552 eV/particle
ionization energy of Ca (Calci)
enthalpy of vaporization
153.6 kJ/mol
enthalpy of fusion
9.2 kJ/mol
standard enthalpy of formation
177.8 kJ/mol
Electron
plisgyn yr electron2, 8, 8, 2
Bohr model: Ca (Calci)
valence electron2
Lewis structure: Ca (Calci)
trefn yr electronnau[Ar] 4s2
1s2 2s2 2p6 3s2 3p6 4s2
Enhanced Bohr model of Ca (Calci)
Orbital Diagram of Ca (Calci)
Cyflwr ocsidiad1, 2
Electronegatifedd
1
Electrophilicity Index
0.7734001442996138 eV/particle
cyflwr sylfaenol mater
cyflwr materSolid
gaseous state of matter
Boiling Point
1,757.15 K
Melting Point
1,115.15 K
critical pressure
critical temperature
triple point
appearance
lliw
Silver
appearance
Mynegrif plygiant
nodwedd ffisegol gwrthrych
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
electrical properties
typeConductor
dargludedd trydanol
29 MS/m
Gwrthedd
0.00000003399999999999 m Ω
superconductivity
magnetism
typeparamagnetic
magnetic susceptibility (Mass)
0.0000000138 m³/Kg
magnetic susceptibility (Molar)
0.0000000005531 m³/mol
magnetic susceptibility (Volume)
0.00002139
magnetic ordering
Curie temperature
Néel temperature
strwythur
Crystal StructureFace Centered Cubic (FCC)
lattice constant
5.58 Å
Lattice Anglesπ/2, π/2, π/2
nodwedd mecanyddol deunyddiau
hardness
1.75 MPa
bulk modulus
17 GPa
shear modulus
7.4 GPa
Young's modulus
20 GPa
Poisson's ratio
0.31
speed of sound
3,810 m/s
classification
CategoryAlkaline earth metals, Alkaline earth metals
CAS GroupIIA
IUPAC GroupIIA
Glawe Number16
Mendeleev Number7
Pettifor Number16
Geochemical Classmajor
Goldschmidt classificationlitophile

other

Gas Basicity
polarizability
160.8 ± 4 a₀
C6 Dispersion Coefficient
2,163 a₀
allotrope
Neutron cross section
0.43
Neutron Mass Absorption
0.00037
quantum number1S0
space group225 (Fm_3m)

Isotopes of Calcium

Stable Isotopes3
Unstable Isotopes26
Natural Isotopes6
Isotopic Composition4096.94%4096.94%442.09%442.09%420.65%420.65%430.14%430.14%460.00%460.00%480.19%480.19%

33Ca

Rhif màs33
neutron number13
relative atomic mass
33.033312 ± 0.000429 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
spin5/2
nuclear quadrupole moment
dyddiad darganfod
parity+

decay modeintensity
p (proton emission)

34Ca

Rhif màs34
neutron number14
relative atomic mass
34.015985 ± 0.000322 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
spin0
nuclear quadrupole moment
0
dyddiad darganfod
parity+

decay modeintensity
2p (2-proton emission)

35Ca

Rhif màs35
neutron number15
relative atomic mass
35.005572 ± 0.000215 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
25.7 ± 0.2 ms
spin1/2
nuclear quadrupole moment
0
dyddiad darganfod1985
parity+

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

36Ca

Rhif màs36
neutron number16
relative atomic mass
35.993074388 ± 0.000042941 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
100.9 ± 1.3 ms
spin0
nuclear quadrupole moment
0
dyddiad darganfod1977
parity+

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

37Ca

Rhif màs37
neutron number17
relative atomic mass
36.985897849 ± 0.00000068 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
181 ± 0.9 ms
spin3/2
nuclear quadrupole moment
dyddiad darganfod1964
parity+

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

38Ca

Rhif màs38
neutron number18
relative atomic mass
37.976319223 ± 0.000000208 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
443.7 ± 0.25 ms
spin0
nuclear quadrupole moment
0
dyddiad darganfod1966
parity+

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%

39Ca

Rhif màs39
neutron number19
relative atomic mass
38.970710811 ± 0.00000064 Da
g-factor
0.68093333333333 ± 0.00010666666666667
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
860.3 ± 0.8 ms
spin3/2
nuclear quadrupole moment
0.038 ± 0.003
dyddiad darganfod1943
parity+

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%

40Ca

Rhif màs40
neutron number20
relative atomic mass
39.96259085 ± 0.000000022 Da
g-factor
0
natural abundance
96.941 ± 0.156
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
spin0
nuclear quadrupole moment
0
dyddiad darganfod1922
parity+

decay modeintensity
+ (double β+ decay)

41Ca

Rhif màs41
neutron number21
relative atomic mass
40.962277905 ± 0.000000147 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
99.4 ± 1.5 ky
spin7/2
nuclear quadrupole moment
-0.0665 ± 0.0018
dyddiad darganfod1939
parity-

decay modeintensity
ϵ (electron capture)100%

42Ca

Rhif màs42
neutron number22
relative atomic mass
41.95861778 ± 0.000000159 Da
g-factor
0
natural abundance
0.647 ± 0.023
Dadfeilio ymbelydrolstable isotope
Hanner oesNot Radioactive ☢️
spin0
nuclear quadrupole moment
0
dyddiad darganfod1934
parity+

43Ca

Rhif màs43
neutron number23
relative atomic mass
42.958766381 ± 0.000000244 Da
g-factor
-0.37638 ± 0.000017142857142857
natural abundance
0.135 ± 0.01
Dadfeilio ymbelydrolstable isotope
Hanner oesNot Radioactive ☢️
spin7/2
nuclear quadrupole moment
-0.0408 ± 0.0008
dyddiad darganfod1934
parity-

44Ca

Rhif màs44
neutron number24
relative atomic mass
43.955481489 ± 0.000000348 Da
g-factor
0
natural abundance
2.086 ± 0.11
Dadfeilio ymbelydrolstable isotope
Hanner oesNot Radioactive ☢️
spin0
nuclear quadrupole moment
0
dyddiad darganfod1922
parity+

45Ca

Rhif màs45
neutron number25
relative atomic mass
44.95618627 ± 0.000000392 Da
g-factor
-0.37897142857143 ± 0.00037142857142857
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
162.61 ± 0.09 d
spin7/2
nuclear quadrupole moment
0.038 ± 0.012
dyddiad darganfod1940
parity-

decay modeintensity
β (β decay)100%

46Ca

Rhif màs46
neutron number26
relative atomic mass
45.953687726 ± 0.000002398 Da
g-factor
0
natural abundance
0.004 ± 0.003
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
spin0
nuclear quadrupole moment
0
dyddiad darganfod1938
parity+

decay modeintensity
(double β decay)

47Ca

Rhif màs47
neutron number27
relative atomic mass
46.954541134 ± 0.000002384 Da
g-factor
-0.40182857142857 ± 0.00031428571428571
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
4.536 ± 0.003 d
spin7/2
nuclear quadrupole moment
0.084 ± 0.006
dyddiad darganfod1951
parity-

decay modeintensity
β (β decay)100%

48Ca

Rhif màs48
neutron number28
relative atomic mass
47.952522654 ± 0.000000018 Da
g-factor
0
natural abundance
0.187 ± 0.021
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
56 ± 10 Ey
spin0
nuclear quadrupole moment
0
dyddiad darganfod1938
parity+

decay modeintensity
(double β decay)
β (β decay)

49Ca

Rhif màs49
neutron number29
relative atomic mass
48.955662625 ± 0.00000019 Da
g-factor
-0.91993333333333 ± 0.00053333333333333
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
8.718 ± 0.006 m
spin3/2
nuclear quadrupole moment
-0.036 ± 0.003
dyddiad darganfod1950
parity-

decay modeintensity
β (β decay)100%

50Ca

Rhif màs50
neutron number30
relative atomic mass
49.957499215 ± 0.0000017 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
13.45 ± 0.05 s
spin0
nuclear quadrupole moment
0
dyddiad darganfod1964
parity+

decay modeintensity
β (β decay)100%

51Ca

Rhif màs51
neutron number31
relative atomic mass
50.960995663 ± 0.00000056 Da
g-factor
-0.69973333333333 ± 0.00073333333333333
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
10 ± 0.8 s
spin3/2
nuclear quadrupole moment
0.036 ± 0.012
dyddiad darganfod1980
parity-

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)

52Ca

Rhif màs52
neutron number32
relative atomic mass
51.963213646 ± 0.00000072 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
4.6 ± 0.3 s
spin0
nuclear quadrupole moment
0
dyddiad darganfod1985
parity+

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)2%

53Ca

Rhif màs53
neutron number33
relative atomic mass
52.968451 ± 0.000047 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
461 ± 90 ms
spin1/2
nuclear quadrupole moment
0
dyddiad darganfod1983
parity-

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)40%

54Ca

Rhif màs54
neutron number34
relative atomic mass
53.972989 ± 0.000052 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
90 ± 6 ms
spin0
nuclear quadrupole moment
0
dyddiad darganfod1997
parity+

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)
2n (2-neutron emission)

55Ca

Rhif màs55
neutron number35
relative atomic mass
54.979978 ± 0.000172 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
22 ± 2 ms
spin5/2
nuclear quadrupole moment
dyddiad darganfod1997
parity-

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)
2n (2-neutron emission)

56Ca

Rhif màs56
neutron number36
relative atomic mass
55.985496 ± 0.000268 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
11 ± 2 ms
spin0
nuclear quadrupole moment
0
dyddiad darganfod1997
parity+

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)
2n (2-neutron emission)

57Ca

Rhif màs57
neutron number37
relative atomic mass
56.992958 ± 0.000429 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
spin5/2
nuclear quadrupole moment
dyddiad darganfod2009
parity-

decay modeintensity
β (β decay)
β n (β-delayed neutron emission)
2n (2-neutron emission)

58Ca

Rhif màs58
neutron number38
relative atomic mass
57.998357 ± 0.000537 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
spin0
nuclear quadrupole moment
0
dyddiad darganfod2009
parity+

decay modeintensity
β (β decay)
β n (β-delayed neutron emission)
2n (2-neutron emission)

59Ca

Rhif màs59
neutron number39
relative atomic mass
59.006237 ± 0.000644 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
spin5/2
nuclear quadrupole moment
dyddiad darganfod2018
parity-

decay modeintensity
β (β decay)
β n (β-delayed neutron emission)
2n (2-neutron emission)

60Ca

Rhif màs60
neutron number40
relative atomic mass
60.011809 ± 0.000751 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
spin0
nuclear quadrupole moment
0
dyddiad darganfod2018
parity+

decay modeintensity
β (β decay)
β n (β-delayed neutron emission)
2n (2-neutron emission)

61Ca

Rhif màs61
neutron number41
relative atomic mass
61.020408 ± 0.000859 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
spin1/2
nuclear quadrupole moment
0
dyddiad darganfod
parity-

decay modeintensity
β (β decay)
β n (β-delayed neutron emission)
2n (2-neutron emission)
Calcium 1

hanes

darganfyddwr neu ddyfeisiwrSir Humphrey Davy
man darganfodEngland
dyddiad darganfod1808
geirdarddiadLatin: calx, calcis (lime).
ynganiadKAL-si-em (Saesneg)

source

Abundance
Abundance in Earth's crust
41,500 mg/kg
natural abundance (cefnfor)
412 mg/L
natural abundance (corff dynol)
1.4 %
natural abundance (Awyrfaen)
1.1 %
natural abundance (Haul)
0.007 %
Abundance in Universe
0.007 %

Nuclear Screening Constants

1s0.527
2p3.9586
2s6.2236
3p11.3417
3s10.3985
4s15.602