Strontyum (Sr)

chemical element with symbol Sr and atomic number 38

Atomic Number	38
Atomic Weight	87.62
mass number	88

Group	2
Period	5
Block	s

proton	38 p⁺
neutron	50 n⁰
electron	38 e^-

Physical Property

Atomic Radius	200 pm 279 pm
molar volume	33.7 cm³/mol
covalent radius	185 pm 157 pm 139 pm 195 pm 195 pm
Metallic Radius	191 pm 215 pm
ionic radius	118 pm 121 pm 126 pm 131 pm 136 pm 144 pm
Crystal Radius	132 pm 135 pm 140 pm 145 pm 150 pm 158 pm
Van der Waals radius	255 pm 249 pm 300 pm 249 pm 364.1 pm
dosedh	2.64 g/cm³ 2,375 kg/m³

Chemical Property

nerth

proton affinity
electron affinity	0.048 eV/particle
ionization energy	5.6948672 eV/particle 11.030276 eV/particle 42.88353 eV/particle 56.28 eV/particle 71 eV/particle 88 eV/particle 104 eV/particle 121.21 eV/particle 158.3 eV/particle 177 eV/particle 324.07 eV/particle 362 eV/particle 408 eV/particle 454 eV/particle 499 eV/particle 562 eV/particle 612 eV/particle 665 eV/particle 722 eV/particle 774 eV/particle 932 eV/particle 982.1 eV/particle 1,038 eV/particle 1,105 eV/particle 1,165 eV/particle 1,211 eV/particle 1,333.4 eV/particle 1,387.19 eV/particle 3,344.7 eV/particle 3,497 eV/particle 3,664 eV/particle 3,830 eV/particle 4,053 eV/particle 4,232 eV/particle 4,465 eV/particle 4,612.397 eV/particle 19,345.587 eV/particle 20,025.23 eV/particle

enthalpy of vaporization	144 kJ/mol
enthalpy of fusion	9.2 kJ/mol
standard enthalpy of formation	164 kJ/mol
electron

electron shell	2, 8, 18, 8, 2

valence electron	2 ⓘ

aray an elektrons	[Kr] 5s²ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s²

oxidation number	1, 2
electronegativity	5.695 eV/particle 0.1185082 0.95
Electrophilicity Index	0.730062406922635 eV/particle
fundamental state of matter

phase of matter	Solid
gaseous state of matter
Boiling Point	1,650.15 K
Melting Point	1,050.15 K
critical pressure
critical temperature
triple point
appearance
liw	Silver #ff1493 #00ff00 #00ff00
appearance
refractive index
thermodynamic material property
Thermal Conductivity
thermal expansion	0.0000225 1/K
molar heat capacity	26.79 J/(mol K)
Specific Heat Capacity	0.306 J/(g⋅K)
heat capacity ratio
electrical properties
type	Conductor
electrical conductivity	7.7 MS/m
electrical resistivity	0.00000013 Ω*m
superconductivity
magnetism
type	paramagnetic
magnetic susceptibility (Mass)	0.00000000132 m³/Kg
magnetic susceptibility (Molar)	0.000000000116 m³/mol
magnetic susceptibility (Volume)	0.00000347
magnetic ordering
Curie temperature
Néel temperature
kesweyth
Crystal Structure	Face Centered Cubic (FCC)
lattice constant	6.08 Å
Lattice Angles	π/2, π/2, π/2
mechanical property
hardness	1.5 MPa
bulk modulus
shear modulus	6.1 GPa
Young's modulus
Poisson's ratio	0.28
speed of sound
classification
Category	Alkaline earth metals, Alkaline earth metals
CAS Group	IIA
IUPAC Group	IIA
Glawe Number	15
Mendeleev Number	8
Pettifor Number	15
Geochemical Class	alkaline earth metal
Goldschmidt classification	litophile

other

Gas Basicity
polarizability	197.2 ± 0.2 a₀
C6 Dispersion Coefficient	3,175 a₀ 3,230 a₀
allotrope
Neutron cross section	1.2
Neutron Mass Absorption	0.0005
quantum number	1S0
space group	225 (Fm_3m)

Isotopes of Strontium

Stable Isotopes	3
Unstable Isotopes	32
Natural Isotopes	4

⁷³Sr

mass number	73
neutron number	35
relative atomic mass	72.9657 ± 0.00043 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	25.3 ± 1.4 ms
spin	5/2
nuclear quadrupole moment
dydhyas diskudhans	1993
parity	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	63%

⁷⁴Sr

mass number	74
neutron number	36
relative atomic mass	73.95617 ± 0.000107 Da
g-factor	0
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	27.6 ± 2.6 ms
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1995
parity	+

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

⁷⁵Sr

mass number	75
neutron number	37
relative atomic mass	74.949952767 ± 0.000236183 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	85.2 ± 2.3 ms
spin	3/2
nuclear quadrupole moment
dydhyas diskudhans	1991
parity	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	5.2%

⁷⁶Sr

mass number	76
neutron number	38
relative atomic mass	75.94176276 ± 0.000037 Da
g-factor	0
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	7.89 ± 0.07 s
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1990
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	3.4%

⁷⁷Sr

mass number	77
neutron number	39
relative atomic mass	76.937945454 ± 0.0000085 Da
g-factor	-0.1392 ± 0.0016
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	9 ± 0.2 s
spin	5/2
nuclear quadrupole moment	1.27 ± 0.05
dydhyas diskudhans	1976
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	0.08%

⁷⁸Sr

mass number	78
neutron number	40
relative atomic mass	77.932179979 ± 0.000008 Da
g-factor	0
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	156.1 ± 2.7 s
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1982
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

⁷⁹Sr

mass number	79
neutron number	41
relative atomic mass	78.929704692 ± 0.000007967 Da
g-factor	-0.316 ± 0.0026666666666667
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	2.25 ± 0.1 m
spin	3/2
nuclear quadrupole moment	0.661 ± 0.006
dydhyas diskudhans	1972
parity	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

⁸⁰Sr

mass number	80
neutron number	42
relative atomic mass	79.924517538 ± 0.000003718 Da
g-factor	0
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	106.3 ± 1.5 m
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1961
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

⁸¹Sr

mass number	81
neutron number	43
relative atomic mass	80.923211393 ± 0.000003358 Da
g-factor	1.086 ± 0.008
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	22.3 ± 0.4 m
spin	1/2
nuclear quadrupole moment	0
dydhyas diskudhans	1952
parity	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

⁸²Sr

mass number	82
neutron number	44
relative atomic mass	81.918399845 ± 0.000006432 Da
g-factor	0
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	25.35 ± 0.03 d
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1952
parity	+

decay mode	intensity
ϵ (electron capture)	100%

⁸³Sr

mass number	83
neutron number	45
relative atomic mass	82.917554372 ± 0.000007336 Da
g-factor	-0.237 ± 0.0002
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	32.41 ± 0.03 h
spin	7/2
nuclear quadrupole moment	0.708 ± 0.011
dydhyas diskudhans	1952
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

⁸⁴Sr

mass number	84
neutron number	46
relative atomic mass	83.913419118 ± 0.000001334 Da
g-factor	0
natural abundance	0.56 ± 0.02
radioactivity	☢️ elven radyoweythresek
half-life
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1936
parity	+

decay mode	intensity
2β⁺ (double β⁺ decay)

⁸⁵Sr

mass number	85
neutron number	47
relative atomic mass	84.912932041 ± 0.00000302 Da
g-factor	-0.22224444444444 ± 0.00015555555555556
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	64.846 ± 0.006 d
spin	9/2
nuclear quadrupole moment	0.263 ± 0.014
dydhyas diskudhans	1940
parity	+

decay mode	intensity
ϵ (electron capture)	100%

⁸⁶Sr

mass number	86
neutron number	48
relative atomic mass	85.90926072473 ± 0.00000000563 Da
g-factor	0
natural abundance	9.86 ± 0.2
radioactivity	stable isotope
half-life	Not Radioactive ☢️
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1931
parity	+

⁸⁷Sr

mass number	87
neutron number	49
relative atomic mass	86.90887749454 ± 0.0000000055 Da
g-factor	-0.24292444444444 ± 0.000024444444444444
natural abundance	7 ± 0.2
radioactivity	stable isotope
half-life	Not Radioactive ☢️
spin	9/2
nuclear quadrupole moment	0.305 ± 0.002
dydhyas diskudhans	1931
parity	+

⁸⁸Sr

mass number	88
neutron number	50
relative atomic mass	87.905612253 ± 0.000000006 Da
g-factor	0
natural abundance	82.58 ± 0.35
radioactivity	stable isotope
half-life	Not Radioactive ☢️
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1923
parity	+

⁸⁹Sr

mass number	89
neutron number	51
relative atomic mass	88.907450808 ± 0.000000098 Da
g-factor	-0.4592 ± 0.0008
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	50.563 ± 0.025 d
spin	5/2
nuclear quadrupole moment	-0.253 ± 0.008
dydhyas diskudhans	1937
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁹⁰Sr

mass number	90
neutron number	52
relative atomic mass	89.90772787 ± 0.000001555 Da
g-factor	0
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	28.91 ± 0.03 y
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1948
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁹¹Sr

mass number	91
neutron number	53
relative atomic mass	90.910195942 ± 0.000005853 Da
g-factor	-0.354 ± 0.0008
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	9.65 ± 0.06 h
spin	5/2
nuclear quadrupole moment	0.042 ± 0.01
dydhyas diskudhans	1943
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁹²Sr

mass number	92
neutron number	54
relative atomic mass	91.911038222 ± 0.000003675 Da
g-factor	0
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	2.611 ± 0.017 h
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1956
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁹³Sr

mass number	93
neutron number	55
relative atomic mass	92.914024314 ± 0.000008109 Da
g-factor	-0.3172 ± 0.0008
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	7.43 ± 0.03 m
spin	5/2
nuclear quadrupole moment	0.24 ± 0.01
dydhyas diskudhans	1959
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁹⁴Sr

mass number	94
neutron number	56
relative atomic mass	93.915355641 ± 0.000001785 Da
g-factor	0
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	75.3 ± 0.2 s
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1959
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁹⁵Sr

mass number	95
neutron number	57
relative atomic mass	94.919358282 ± 0.000006237 Da
g-factor	-1.074 ± 0.004
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	23.9 ± 0.14 s
spin	1/2
nuclear quadrupole moment	0
dydhyas diskudhans	1961
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁹⁶Sr

mass number	96
neutron number	58
relative atomic mass	95.921719045 ± 0.000009089 Da
g-factor	0
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	1.059 ± 0.008 s
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1971
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)

⁹⁷Sr

mass number	97
neutron number	59
relative atomic mass	96.926375621 ± 0.000003633 Da
g-factor	-0.996 ± 0.004
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	432 ± 4 ms
spin	1/2
nuclear quadrupole moment	0
dydhyas diskudhans	1978
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	0.02%

⁹⁸Sr

mass number	98
neutron number	60
relative atomic mass	97.928692636 ± 0.000003463 Da
g-factor	0
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	653 ± 2 ms
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1971
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	0.23%

⁹⁹Sr

mass number	99
neutron number	61
relative atomic mass	98.932883604 ± 0.000005085 Da
g-factor	-0.174 ± 0.0033333333333333
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	269.2 ± 1 ms
spin	3/2
nuclear quadrupole moment	0.76 ± 0.04
dydhyas diskudhans	1975
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	0.1%

¹⁰⁰Sr

mass number	100
neutron number	62
relative atomic mass	99.93578327 ± 0.000007426 Da
g-factor	0
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	202.1 ± 1.7 ms
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1978
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	1.11%

¹⁰¹Sr

mass number	101
neutron number	63
relative atomic mass	100.940606264 ± 0.000009103 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	113.7 ± 1.7 ms
spin	5/2
nuclear quadrupole moment
dydhyas diskudhans	1983
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	2.75%

¹⁰²Sr

mass number	102
neutron number	64
relative atomic mass	101.944004679 ± 0.000072 Da
g-factor	0
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	69 ± 6 ms
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1986
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	5.5%

¹⁰³Sr

mass number	103
neutron number	65
relative atomic mass	102.949243 ± 0.000215 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	53 ± 10 ms
spin	5/2
nuclear quadrupole moment
dydhyas diskudhans	1997
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

¹⁰⁴Sr

mass number	104
neutron number	66
relative atomic mass	103.953022 ± 0.000322 Da
g-factor	0
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	50.6 ± 4.2 ms
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1997
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

¹⁰⁵Sr

mass number	105
neutron number	67
relative atomic mass	104.959001 ± 0.000537 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	39 ± 5 ms
spin	5/2
nuclear quadrupole moment
dydhyas diskudhans	1997
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

¹⁰⁶Sr

mass number	106
neutron number	68
relative atomic mass	105.963177 ± 0.000644 Da
g-factor	0
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	21 ± 8 ms
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	2010
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

¹⁰⁷Sr

mass number	107
neutron number	69
relative atomic mass	106.969672 ± 0.000751 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life
spin	1/2
nuclear quadrupole moment	0
dydhyas diskudhans	2010
parity	+

decay mode	intensity
β⁻ (β⁻ decay)
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

istori

diskudher po dismyger	A. Crawford
location of discovery	Scotland
dydhyas diskudhans	1790
Etymologyl	From the Scottish town, Strontian.
pronunciation	STRON-she-em (en)

source

Abundance
Abundance in Earth's crust	370 mg/kg
natural abundance (Keynvor)	7.9 mg/L
natural abundance (Korf)	0.00046 %
natural abundance (meteoroid)	0.00087 %
natural abundance (Howl)	0.000005 %
Abundance in Universe	0.000004 %

Nuclear Screening Constants

1	s	0.8089
2	p	3.9696
2	s	10.0982
3	d	15.2738
3	p	15.8324
3	s	15.3362
4	p	26.068
4	s	24.5556
5	s	31.9295

Strontyum on ChemicalAid

Art & Architecture Thesaurus ID	300379545
Australian Educational Vocabulary ID	scot/3578
BNCF Thesaurus ID	40655
Biblioteca Nacional de España ID	XX528414
Bibliothèque nationale de France ID	12169122m
Brockhaus Enzyklopädie online ID	strontium
CAB ID	18811
CAS Registry Number	7440-24-6
CPV Supplementary	AA34
ChEBI ID	33324
ChemSpider ID	4514263
Common Procurement Vocabulary	14772000
DSSTOX compound identifier	DTXCID50875720
DSSTox substance ID	DTXSID3024312
Den Store Danske ID	strontium
ECHA Substance Infocard ID	100.028.303
Encyclopædia Britannica Online ID	science/strontium
Encyclopædia Universalis ID	strontium
Freebase ID	/m/025sf8p
Golden ID	Strontium-VWJ5P
Gran Enciclopèdia Catalana ID	0106810
Great Russian Encyclopedia Online ID	4169533
HSDB ID	2545
Human Metabolome Database ID	HMDB0003642
ICSC ID	1534
InChI	InChI=1S/Sr
InChIKey	CIOAGBVUUVVLOB-UHFFFAOYSA-N
KBpedia ID	Strontium
KEGG ID	C13884
Krugosvet article	biologiya/stronciy
Library of Congress authority ID	sh85129178
MeSH descriptor ID	D013324
NALT ID	6424
NDL Authority ID	00571781
NE.se ID	strontium
NKCR AUT ID	ph543045
Namuwiki ID	스트론튬
National Library of Israel J9U ID	987007541334305171
OmegaWiki Defined Meaning	3646
OpenAlex ID	C518915863
PSH ID	5753
PubChem CID	5359327
Quora topic ID	Strontium
RxNorm ID	10122
Römpp online ID	RD-19-04457
Store norske leksikon ID	strontium
Treccani's Enciclopedia Italiana ID	stronzio
Treccani ID	stronzio
UNII	YZS2RPE8LE
USGS Thesaurus ID	1581
WordNet 3.1 Synset ID	14679910-n
YSO ID	3096
ZVG number	8310
honanieth GND	4183762-9

Strontyum (Sr)

Physical Property

Chemical Property

other

Isotopes of Strontium

73Sr

74Sr

75Sr

76Sr

77Sr

78Sr

79Sr

80Sr

81Sr

82Sr

83Sr

84Sr

85Sr

86Sr

87Sr

88Sr

89Sr

90Sr

91Sr

92Sr

93Sr

94Sr

95Sr

96Sr

97Sr

98Sr

99Sr

100Sr

101Sr

102Sr

103Sr

104Sr

105Sr

106Sr

107Sr

istori

source

Nuclear Screening Constants

⁷³Sr

⁷⁴Sr

⁷⁵Sr

⁷⁶Sr

⁷⁷Sr

⁷⁸Sr

⁷⁹Sr

⁸⁰Sr

⁸¹Sr

⁸²Sr

⁸³Sr

⁸⁴Sr

⁸⁵Sr

⁸⁶Sr

⁸⁷Sr

⁸⁸Sr

⁸⁹Sr

⁹⁰Sr

⁹¹Sr

⁹²Sr

⁹³Sr

⁹⁴Sr

⁹⁵Sr

⁹⁶Sr

⁹⁷Sr

⁹⁸Sr

⁹⁹Sr

¹⁰⁰Sr

¹⁰¹Sr

¹⁰²Sr

¹⁰³Sr

¹⁰⁴Sr

¹⁰⁵Sr

¹⁰⁶Sr

¹⁰⁷Sr