Calyum (K)

chemical element with symbol K and atomic number 19

Atomic Number	19
Atomic Weight	39.0983
mass number	39

Group	1
Period	4
Block	s

proton	19 p⁺
neutron	20 n⁰
electron	19 e^-

Physical Property

Atomic Radius	220 pm 234 pm
molar volume	45.3 cm³/mol
covalent radius	196 pm 193 pm 207 pm 203 pm
Metallic Radius	203 pm 235 pm
ionic radius	137 pm 138 pm 146 pm 151 pm 155 pm 159 pm 164 pm
Crystal Radius	151 pm 152 pm 160 pm 165 pm 169 pm 173 pm 178 pm
Van der Waals radius	280 pm 275 pm 275 pm 309 pm 381.2 pm
dosedh	0.89 g/cm³ 828 kg/m³

Chemical Property

nerth

proton affinity
electron affinity	0.50147 eV/particle
ionization energy	4.34066354 eV/particle 31.625 eV/particle 45.8031 eV/particle 60.917 eV/particle 82.66 eV/particle 99.4 eV/particle 117.56 eV/particle 154.87 eV/particle 175.8174 eV/particle 503.67 eV/particle 565.6 eV/particle 631 eV/particle 714.71 eV/particle 786.26 eV/particle 860.92 eV/particle 967.66 eV/particle 1,034.541 eV/particle 4,610.86998 eV/particle 4,934.0482 eV/particle

enthalpy of vaporization	2.33 kJ/mol
enthalpy of fusion	102.5 kJ/mol
standard enthalpy of formation	89 kJ/mol
electron

electron shell	2, 8, 8, 1

valence electron	1 ⓘ

aray an elektrons	[Ar] 4s¹ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹

oxidation number	-1, 1
electronegativity	4.34 eV/particle 0.0981896 0.82
Electrophilicity Index	0.7633848415985606 eV/particle
fundamental state of matter

phase of matter	Solid
gaseous state of matter
Boiling Point	1,032.15 K
Melting Point	336.65 K
critical pressure	16 MPa
critical temperature	2,223.15 K
triple point
appearance
liw	Silver #ff1493 #8f40d4 #8f40d4
appearance	silvery gray
refractive index
thermodynamic material property
Thermal Conductivity	79 W/(m K)
thermal expansion
molar heat capacity	29.6 J/(mol K)
Specific Heat Capacity	0.757 J/(g⋅K)
heat capacity ratio
electrical properties
type	Conductor
electrical conductivity	14 MS/m
electrical resistivity	0.00000007000000000002 Ω*m
superconductivity
magnetism
type	paramagnetic
magnetic susceptibility (Mass)	0.0000000067 m³/Kg
magnetic susceptibility (Molar)	0.000000000262 m³/mol
magnetic susceptibility (Volume)	0.00000574
magnetic ordering
Curie temperature
Néel temperature
kesweyth
Crystal Structure	Body Centered Cubic (BCC)
lattice constant	5.23 Å
Lattice Angles	π/2, π/2, π/2
mechanical property
hardness	0.363 MPa 0.4 MPa
bulk modulus	3.1 GPa
shear modulus	1.3 GPa
Young's modulus
Poisson's ratio
speed of sound	2,000 m/s
classification
Category	Alkali metals, Alkali metals
CAS Group	IA
IUPAC Group	IA
Glawe Number	10
Mendeleev Number	3
Pettifor Number	10
Geochemical Class	alkali metal
Goldschmidt classification	litophile

other

Gas Basicity
polarizability	289.7 ± 0.3 a₀
C6 Dispersion Coefficient	3,923 a₀ 3,910 a₀
allotrope
Neutron cross section	2.1
Neutron Mass Absorption	0.0018
quantum number	2S1/2
space group	229 (Im_3m)

Isotopes of Potassium

Stable Isotopes	2
Unstable Isotopes	27
Natural Isotopes	3

³¹K

mass number	31
neutron number	12
relative atomic mass	31.03678 ± 0.000322 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life
spin	3/2
nuclear quadrupole moment
dydhyas diskudhans	2019
parity	+

decay mode	intensity
3p	100%

³²K

mass number	32
neutron number	13
relative atomic mass	32.023607 ± 0.000429 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life
spin	1
nuclear quadrupole moment
dydhyas diskudhans
parity	+

decay mode	intensity
p (proton emission)

³³K

mass number	33
neutron number	14
relative atomic mass	33.008095 ± 0.000215 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life
spin	3/2
nuclear quadrupole moment
dydhyas diskudhans
parity	+

decay mode	intensity
p (proton emission)

³⁴K

mass number	34
neutron number	15
relative atomic mass	33.99869 ± 0.00021 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life
spin	1
nuclear quadrupole moment
dydhyas diskudhans
parity	+

decay mode	intensity
p (proton emission)

³⁵K

mass number	35
neutron number	16
relative atomic mass	34.988005406 ± 0.00000055 Da
g-factor	0.26133333333333 ± 0.0046666666666667
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	175.2 ± 1.9 ms
spin	3/2
nuclear quadrupole moment
dydhyas diskudhans	1976
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	0.37%

³⁶K

mass number	36
neutron number	17
relative atomic mass	35.981301887 ± 0.000000349 Da
g-factor	0.274 ± 0.0005
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	341 ± 3 ms
spin	2
nuclear quadrupole moment
dydhyas diskudhans	1967
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	0.048%
β⁺α (β⁺-delayed α emission)	0.0034%

³⁷K

mass number	37
neutron number	18
relative atomic mass	36.97337589 ± 0.0000001 Da
g-factor	0.13547333333333 ± 0.00004
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	1.23651 ± 0.00094 s
spin	3/2
nuclear quadrupole moment	0.109 ± 0.004
dydhyas diskudhans	1958
parity	+

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

³⁸K

mass number	38
neutron number	19
relative atomic mass	37.969081114 ± 0.000000209 Da
g-factor	0.457 ± 0.002
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	7.651 ± 0.019 m
spin	3
nuclear quadrupole moment
dydhyas diskudhans	1937
parity	+

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

³⁹K

mass number	39
neutron number	20
relative atomic mass	38.96370648482 ± 0.00000000489 Da
g-factor	0.26098 ± 0.0000053333333333333
natural abundance	93.2581 ± 0.0044
radioactivity	stable isotope
half-life	Not Radioactive ☢️
spin	3/2
nuclear quadrupole moment	0.0603 ± 0.0006
dydhyas diskudhans	1921
parity	+

⁴⁰K

mass number	40
neutron number	21
relative atomic mass	39.963998165 ± 0.00000006 Da
g-factor
natural abundance	0.0117 ± 0.0001
radioactivity	☢️ elven radyoweythresek
half-life	1.248 ± 0.003 Gy
spin	4
nuclear quadrupole moment	-0.075 ± 0.0008
dydhyas diskudhans	1935
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	89.28%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	10.72%

⁴¹K

mass number	41
neutron number	22
relative atomic mass	40.96182525611 ± 0.00000000403 Da
g-factor	0.143248 ± 0.0000033333333333333
natural abundance	6.7302 ± 0.0044
radioactivity	stable isotope
half-life	Not Radioactive ☢️
spin	3/2
nuclear quadrupole moment	0.0734 ± 0.0007
dydhyas diskudhans	1921
parity	+

⁴²K

mass number	42
neutron number	23
relative atomic mass	41.962402305 ± 0.000000113 Da
g-factor	-0.57125 ± 0.0003
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	12.355 ± 0.007 h
spin	2
nuclear quadrupole moment
dydhyas diskudhans	1935
parity	-

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

⁴³K

mass number	43
neutron number	24
relative atomic mass	42.960734701 ± 0.00000044 Da
g-factor	0.10886666666667 ± 0.00053333333333333
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	22.3 ± 0.1 h
spin	3/2
nuclear quadrupole moment
dydhyas diskudhans	1949
parity	+

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

⁴⁴K

mass number	44
neutron number	25
relative atomic mass	43.961586984 ± 0.00000045 Da
g-factor	-0.428 ± 0.002
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	22.13 ± 0.19 m
spin	2
nuclear quadrupole moment
dydhyas diskudhans	1954
parity	-

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

⁴⁵K

mass number	45
neutron number	26
relative atomic mass	44.960691491 ± 0.00000056 Da
g-factor	0.1156 ± 0.00053333333333333
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	17.8 ± 0.6 m
spin	3/2
nuclear quadrupole moment
dydhyas diskudhans	1964
parity	+

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

⁴⁶K

mass number	46
neutron number	27
relative atomic mass	45.961981584 ± 0.00000078 Da
g-factor	-0.5255 ± 0.003
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	96.3 ± 0.08 s
spin	2
nuclear quadrupole moment
dydhyas diskudhans	1965
parity	-

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

⁴⁷K

mass number	47
neutron number	28
relative atomic mass	46.961661612 ± 0.0000015 Da
g-factor	3.866 ± 0.018
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	17.38 ± 0.03 s
spin	1/2
nuclear quadrupole moment	0
dydhyas diskudhans	1964
parity	+

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

⁴⁸K

mass number	48
neutron number	29
relative atomic mass	47.965341184 ± 0.00000083 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	6.83 ± 0.14 s
spin	1
nuclear quadrupole moment
dydhyas diskudhans	1972
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	1.14%

⁴⁹K

mass number	49
neutron number	30
relative atomic mass	48.968210753 ± 0.00000086 Da
g-factor	2.6772 ± 0.0016
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	1.26 ± 0.05 s
spin	1/2
nuclear quadrupole moment	0
dydhyas diskudhans	1972
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	86%

⁵⁰K

mass number	50
neutron number	31
relative atomic mass	49.972380015 ± 0.0000083 Da
g-factor	0
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	472 ± 4 ms
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1972
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	28.6%
2n (2-neutron emission)

⁵¹K

mass number	51
neutron number	32
relative atomic mass	50.975828664 ± 0.000014 Da
g-factor	0.342 ± 0.0013333333333333
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	365 ± 5 ms
spin	3/2
nuclear quadrupole moment
dydhyas diskudhans	1983
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	65%
2n (2-neutron emission)

⁵²K

mass number	52
neutron number	33
relative atomic mass	51.981602 ± 0.000036 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	110 ± 4 ms
spin	2
nuclear quadrupole moment
dydhyas diskudhans	1983
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	72.2%
2n (2-neutron emission)	2.3%

⁵³K

mass number	53
neutron number	34
relative atomic mass	52.9868 ± 0.00012 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	30 ± 5 ms
spin	3/2
nuclear quadrupole moment
dydhyas diskudhans	1983
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	64%
2n (2-neutron emission)	10%

⁵⁴K

mass number	54
neutron number	35
relative atomic mass	53.994471 ± 0.000429 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	10 ± 5 ms
spin	2
nuclear quadrupole moment
dydhyas diskudhans	1983
parity	-

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

⁵⁵K

mass number	55
neutron number	36
relative atomic mass	55.000505 ± 0.000537 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life
spin	3/2
nuclear quadrupole moment
dydhyas diskudhans	2009
parity	+

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

⁵⁶K

mass number	56
neutron number	37
relative atomic mass	56.008567 ± 0.000644 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life
spin	2
nuclear quadrupole moment
dydhyas diskudhans	2009
parity	-

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

⁵⁷K

mass number	57
neutron number	38
relative atomic mass	57.015169 ± 0.000644 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life
spin	3/2
nuclear quadrupole moment
dydhyas diskudhans	2018
parity	+

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

⁵⁸K

mass number	58
neutron number	39
relative atomic mass	58.023543 ± 0.000751 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life
spin	2
nuclear quadrupole moment
dydhyas diskudhans	2019
parity	-

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

⁵⁹K

mass number	59
neutron number	40
relative atomic mass	59.030864 ± 0.000859 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life
spin	3/2
nuclear quadrupole moment
dydhyas diskudhans	2018
parity	+

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

istori

diskudher po dismyger	Sir Humphrey Davy
location of discovery	England
dydhyas diskudhans	1807
Etymologyl	English: pot ash; symbol from Latin: kalium, (alkali).
pronunciation	pe-TASS-i-em (en)

source

Abundance
Abundance in Earth's crust	20,900 mg/kg
natural abundance (Keynvor)	399 mg/L
natural abundance (Korf)	0.2 %
natural abundance (meteoroid)	0.07 %
natural abundance (Howl)	0.0004 %
Abundance in Universe	0.0003 %

Nuclear Screening Constants

1	s	0.5105
2	p	3.9728
2	s	5.9938
3	p	11.2744
3	s	10.3201
4	s	15.5048

Calyum on ChemicalAid

ATC code	A12BA
Art & Architecture Thesaurus ID	300212821
Australian Educational Vocabulary ID	scot/3560
BNCF Thesaurus ID	22579
Bibliothèque nationale de France ID	121440770
Brockhaus Enzyklopädie online ID	kalium
CAS Registry Number	7440-09-7
ChEBI ID	26216
ChemSpider ID	4575326
DSSTOX compound identifier	DTXCID70820696
DSSTox substance ID	DTXSID9049748
Den Store Danske ID	kalium
DrugBank ID	14500
ECHA Substance Infocard ID	100.028.290
Encyclopedia of China ID (Second Edition)	211021
Encyclopædia Britannica Online ID	science/potassium
Encyclopædia Universalis ID	potassium
EuroVoc ID	2568
Freebase ID	/m/025s7j4
French Vikidia ID	Potassium
Golden ID	Potassium-GEEZJ
Gran Enciclopèdia Catalana ID	0133931
Great Russian Encyclopedia Online ID	2035525
HSDB ID	698
ICSC ID	0716
InChI	InChI=1S/K
InChIKey	ZLMJMSJWJFRBEC-UHFFFAOYSA-N
KBpedia ID	Potassium
KEGG ID	C00238
Krugosvet article	nauka_i_tehnika/himiya/KALI.html
Latvian National Encyclopedia Online ID	133174
Library of Congress authority ID	sh85105593
MeSH descriptor ID	D011188
NDF-RT ID	N0000146069
NDL Authority ID	00565080
NE.se ID	kalium
NKCR AUT ID	ph705338
Namuwiki ID	칼륨
National Library of Israel J9U ID	987007529540605171
OmegaWiki Defined Meaning	7255
OpenAlex ID	C517785266
Open Food Facts ingredient ID	potassium
PSH ID	5746
PubChem CID	5462222
Quora topic ID	Potassium
RxNorm ID	8588
Spanish Vikidia ID	Potasio
Store medisinske leksikon ID	kalium
Store medisinske leksikon ID	kalium_-_fysiologi
Store norske leksikon ID	kalium
Treccani ID	potassio
UMLS CUI	C0032821
UNII	RWP5GA015D
USGS Thesaurus ID	1543
WordNet 3.1 Synset ID	14674986-n
YSO ID	11555
ZVG number	8150
honanieth GND	4139553-0

Calyum (K)

Physical Property

Chemical Property

other

Isotopes of Potassium

31K

32K

33K

34K

35K

36K

37K

38K

39K

40K

41K

42K

43K

44K

45K

46K

47K

48K

49K

50K

51K

52K

53K

54K

55K

56K

57K

58K

59K

istori

source

Nuclear Screening Constants

³¹K

³²K

³³K

³⁴K

³⁵K

³⁶K

³⁷K

³⁸K

³⁹K

⁴⁰K

⁴¹K

⁴²K

⁴³K

⁴⁴K

⁴⁵K

⁴⁶K

⁴⁷K

⁴⁸K

⁴⁹K

⁵⁰K

⁵¹K

⁵²K

⁵³K

⁵⁴K

⁵⁵K

⁵⁶K

⁵⁷K

⁵⁸K

⁵⁹K