Sifir (Cu)

chemical element with symbol Cu and atomic number 29

Atomic Number	29
Atomic Weight	63.546
Hejmara baristeyî	63

Group	11
Period	4
Block	d

Proton	29 p⁺
Notron	34 n⁰
Kareva	29 e^-

Physical Property

Atomic Radius	135 pm 217 pm
molar volume	7,1 cm³/mol
Covalent Radius	112 pm 115 pm 120 pm 137 pm 132 pm
Metallic Radius	118 pm 128 pm
ionic radius	46 pm 60 pm 77 pm 57 pm 57 pm 65 pm 73 pm 54 pm
Crystal Radius	60 pm 74 pm 91 pm 71 pm 71 pm 79 pm 87 pm 60 pm
Van der Waals radius	200 pm 196 pm 226 pm 349,5 pm
density	8,96 g/cm³ 8.020 kg/m³

Chemical Property

wize

proton affinity	655,3 kJ/mol
electron affinity	1,235 eV/particle
ionization energy	7,72638 eV/particle 20,29239 eV/particle 36,841 eV/particle 57,38 eV/particle 79,8 eV/particle 103 eV/particle 139 eV/particle 166 eV/particle 198 eV/particle 232,2 eV/particle 265 eV/particle 367,03 eV/particle 400,98 eV/particle 436,04 eV/particle 483,13 eV/particle 518,7 eV/particle 552,8 eV/particle 632,48 eV/particle 670,608 eV/particle 1.690,5 eV/particle 1.800 eV/particle 1.918 eV/particle 2.044 eV/particle 2.179,4 eV/particle 2.307 eV/particle 2.479,1 eV/particle 2.586,954 eV/particle 11.062,4309 eV/particle 11.567,612 eV/particle

enthalpy of vaporization	304,6 kJ/mol
enthalpy of fusion	13,01 kJ/mol
standard enthalpy of formation	337,4 kJ/mol
Kareva

electron shell	2, 8, 18, 1

valence electron	1 ⓘ

electron configuration	[Ar] 3d¹⁰ 4s¹ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s¹

oxidation number	-2, 0, 1, 2, 3, 4
electronegativity	10,96 eV/particle 0.1511716 1.9
Electrophilicity Index	1,546403297611602 eV/particle
fundamental state of matter

phase of matter	Solid
gaseous state of matter
Boiling Point	2.833,15 K
Melting Point	1.357,77 K
critical pressure
critical temperature
triple point
appearance
color	Copper #a52a2a #c88033 #c88033
appearance	red-orange metallic luster
refractive index
thermodynamic material property
Thermal Conductivity	401 W/(m K)
thermal expansion	0,0000165 1/K
molar heat capacity	24,44 J/(mol K)
Specific Heat Capacity	0,385 J/(g⋅K)
heat capacity ratio
electrical properties
type	Conductor
electrical conductivity	59 MS/m
electrical resistivity	0,000000017 Ω*m
superconductivity
magnetism
type	diamagnetic
magnetic susceptibility (Mass)	-0,00000000108 m³/Kg
magnetic susceptibility (Molar)	-0,0000000000686 m³/mol
magnetic susceptibility (Volume)	-0,00000963
magnetic ordering
Germahiya Curie
Néel temperature
pêkhate
Crystal Structure	Face Centered Cubic (FCC)
lattice constant	3,61 Å
Lattice Angles	π/2, π/2, π/2
mechanical property
hardness	874 MPa 3 MPa 369 MPa
bulk modulus	140 GPa
shear modulus	48 GPa
Young's modulus	130 GPa
Poisson's ratio	0,34
Leza dengê	3.570 m/s
classification
Category	Transition metals, Transition metals
CAS Group	IB
IUPAC Group	IB
Glawe Number	68
Mendeleev Number	71
Pettifor Number	72
Geochemical Class	first series transition metal
Goldschmidt classification	chalcophile

other

Gas Basicity	632,4 kJ/mol
polarizability	46,5 ± 0,5 a₀
C6 Dispersion Coefficient	253 a₀ 264 a₀
allotrope
Neutron cross section	3,78
Neutron Mass Absorption	0,0021
quantum number	2S1/2
space group	225 (Fm_3m)

Isotopes of Copper

Stable Isotopes	2
Unstable Isotopes	31
Natural Isotopes	2

⁵²Cu

Hejmara baristeyî	52
neutron number	23
Giraniya Atomê	51,997982 ± 0,000644 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life
spin	3
nuclear quadrupole moment
dema îcadkirinê yan keşfê
parity	+

decay mode	intensity
p (proton emission)

⁵³Cu

Hejmara baristeyî	53
neutron number	24
Giraniya Atomê	52,985894 ± 0,000537 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life
spin	3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê
parity	-

decay mode	intensity
p (proton emission)

⁵⁴Cu

Hejmara baristeyî	54
neutron number	25
Giraniya Atomê	53,977198 ± 0,000429 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life
spin	3
nuclear quadrupole moment
dema îcadkirinê yan keşfê
parity	+

decay mode	intensity
p (proton emission)

⁵⁵Cu

Hejmara baristeyî	55
neutron number	26
Giraniya Atomê	54,966038 ± 0,000167 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	55,9 ± 1,5 ms
spin	3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1987
parity	-

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

⁵⁶Cu

Hejmara baristeyî	56
neutron number	27
Giraniya Atomê	55,958529278 ± 0,000006864 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	80,8 ± 0,6 ms
spin	4
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1987
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	0.4%

⁵⁷Cu

Hejmara baristeyî	57
neutron number	28
Giraniya Atomê	56,949211686 ± 0,000000537 Da
g-factor	1,7213333333333 ± 0,0046666666666667
natural abundance
radioactivity	☢️ radioactive element
half-life	196,4 ± 0,7 ms
spin	3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1976
parity	-

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

⁵⁸Cu

Hejmara baristeyî	58
neutron number	29
Giraniya Atomê	57,944532283 ± 0,000000604 Da
g-factor	0,571 ± 0,002
natural abundance
radioactivity	☢️ radioactive element
half-life	3,204 ± 0,007 s
spin	1
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1952
parity	+

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

⁵⁹Cu

Hejmara baristeyî	59
neutron number	30
Giraniya Atomê	58,939496713 ± 0,000000566 Da
g-factor	1,2620666666667 ± 0,0006
natural abundance
radioactivity	☢️ radioactive element
half-life	81,5 ± 0,5 s
spin	3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1947
parity	-

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

⁶⁰Cu

Hejmara baristeyî	60
neutron number	31
Giraniya Atomê	59,937363787 ± 0,000001731 Da
g-factor	0,61 ± 0,00025
natural abundance
radioactivity	☢️ radioactive element
half-life	23,7 ± 0,4 m
spin	2
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1947
parity	+

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

⁶¹Cu

Hejmara baristeyî	61
neutron number	32
Giraniya Atomê	60,933457375 ± 0,00000102 Da
g-factor	1,4071333333333 ± 0,00033333333333333
natural abundance
radioactivity	☢️ radioactive element
half-life	3,343 ± 0,016 h
spin	3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1937
parity	-

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

⁶²Cu

Hejmara baristeyî	62
neutron number	33
Giraniya Atomê	61,932594803 ± 0,000000683 Da
g-factor	-0,38 ± 0,0004
natural abundance
radioactivity	☢️ radioactive element
half-life	9,672 ± 0,008 m
spin	1
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1936
parity	+

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

⁶³Cu

Hejmara baristeyî	63
neutron number	34
Giraniya Atomê	62,929597119 ± 0,000000457 Da
g-factor
natural abundance	69,15 ± 0,15
radioactivity	stable isotope
half-life	Not Radioactive ☢️
spin	3/2
nuclear quadrupole moment	-0,22 ± 0,015
dema îcadkirinê yan keşfê	1923
parity	-

⁶⁴Cu

Hejmara baristeyî	64
neutron number	35
Giraniya Atomê	63,929764001 ± 0,000000458 Da
g-factor	-0,2166 ± 0,0004
natural abundance
radioactivity	☢️ radioactive element
half-life	12,7004 ± 0,0013 h
spin	1
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1936
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	61.52%
β⁻ (β⁻ decay)	38.48%

⁶⁵Cu

Hejmara baristeyî	65
neutron number	36
Giraniya Atomê	64,927789476 ± 0,00000069 Da
g-factor
natural abundance	30,85 ± 0,15
radioactivity	stable isotope
half-life	Not Radioactive ☢️
spin	3/2
nuclear quadrupole moment	-0,204 ± 0,014
dema îcadkirinê yan keşfê	1923
parity	-

⁶⁶Cu

Hejmara baristeyî	66
neutron number	37
Giraniya Atomê	65,928868804 ± 0,000000696 Da
g-factor	-0,2826 ± 0,0008
natural abundance
radioactivity	☢️ radioactive element
half-life	5,12 ± 0,014 m
spin	1
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1937
parity	+

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

⁶⁷Cu

Hejmara baristeyî	67
neutron number	38
Giraniya Atomê	66,92772949 ± 0,000000957 Da
g-factor	1,6780666666667 ± 0,0004
natural abundance
radioactivity	☢️ radioactive element
half-life	61,83 ± 0,12 h
spin	3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1948
parity	-

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

⁶⁸Cu

Hejmara baristeyî	68
neutron number	39
Giraniya Atomê	67,929610887 ± 0,0000017 Da
g-factor	2,396 ± 0,0006
natural abundance
radioactivity	☢️ radioactive element
half-life	30,9 ± 0,6 s
spin	1
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1953
parity	+

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

⁶⁹Cu

Hejmara baristeyî	69
neutron number	40
Giraniya Atomê	68,929429267 ± 0,0000015 Da
g-factor	1,8943333333333 ± 0,00066666666666667
natural abundance
radioactivity	☢️ radioactive element
half-life	2,85 ± 0,15 m
spin	3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1966
parity	-

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

⁷⁰Cu

Hejmara baristeyî	70
neutron number	41
Giraniya Atomê	69,932392078 ± 0,000001161 Da
g-factor	0,22801666666667 ± 0,000083333333333333
natural abundance
radioactivity	☢️ radioactive element
half-life	44,5 ± 0,2 s
spin	6
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1971
parity	-

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

⁷¹Cu

Hejmara baristeyî	71
neutron number	42
Giraniya Atomê	70,932676831 ± 0,0000016 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	19,4 ± 1,4 s
spin	3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1983
parity	-

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

⁷²Cu

Hejmara baristeyî	72
neutron number	43
Giraniya Atomê	71,935820306 ± 0,0000015 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	6,63 ± 0,03 s
spin	2
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1983
parity	-

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

⁷³Cu

Hejmara baristeyî	73
neutron number	44
Giraniya Atomê	72,936674376 ± 0,000002084 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	4,2 ± 0,12 s
spin	3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1983
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	0.029%

⁷⁴Cu

Hejmara baristeyî	74
neutron number	45
Giraniya Atomê	73,93987486 ± 0,0000066 Da
g-factor	-0,5335 ± 0,0006
natural abundance
radioactivity	☢️ radioactive element
half-life	1,606 ± 0,009 s
spin	2
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1987
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	0.075%

⁷⁵Cu

Hejmara baristeyî	75
neutron number	46
Giraniya Atomê	74,941523817 ± 0,00000077 Da
g-factor	0,40276 ± 0,0004
natural abundance
radioactivity	☢️ radioactive element
half-life	1,224 ± 0,003 s
spin	5/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1985
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	2.7%

⁷⁶Cu

Hejmara baristeyî	76
neutron number	47
Giraniya Atomê	75,945268974 ± 0,00000098 Da
g-factor	-0,36356666666667 ± 0,0005
natural abundance
radioactivity	☢️ radioactive element
half-life	637,7 ± 5,5 ms
spin	3
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1987
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	7.2%

⁷⁷Cu

Hejmara baristeyî	77
neutron number	48
Giraniya Atomê	76,947543599 ± 0,0000013 Da
g-factor	0,63852 ± 0,00068
natural abundance
radioactivity	☢️ radioactive element
half-life	470,3 ± 1,7 ms
spin	5/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1987
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	30.1%

⁷⁸Cu

Hejmara baristeyî	78
neutron number	49
Giraniya Atomê	77,951916524 ± 0,000014312 Da
g-factor	0,039666666666667 ± 0,0005
natural abundance
radioactivity	☢️ radioactive element
half-life	330,7 ± 2 ms
spin	6
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1991
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	50.6%
2n (2-neutron emission)

⁷⁹Cu

Hejmara baristeyî	79
neutron number	50
Giraniya Atomê	78,9544731 ± 0,0001127 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	241,3 ± 2,1 ms
spin	5/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1991
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	66%
2n (2-neutron emission)

⁸⁰Cu

Hejmara baristeyî	80
neutron number	51
Giraniya Atomê	79,960623 ± 0,000322 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	113,3 ± 6,4 ms
spin
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1995
parity

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	58%
2n (2-neutron emission)

⁸¹Cu

Hejmara baristeyî	81
neutron number	52
Giraniya Atomê	80,965743 ± 0,000322 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	73,2 ± 6,8 ms
spin	5/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê	2010
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	81%
2n (2-neutron emission)

⁸²Cu

Hejmara baristeyî	82
neutron number	53
Giraniya Atomê	81,972378 ± 0,000429 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	34 ± 7 ms
spin
nuclear quadrupole moment
dema îcadkirinê yan keşfê	2010
parity

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

⁸³Cu

Hejmara baristeyî	83
neutron number	54
Giraniya Atomê	82,97811 ± 0,000537 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life
spin	5/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê	2017
parity	-

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

⁸⁴Cu

Hejmara baristeyî	84
neutron number	55
Giraniya Atomê	83,985271 ± 0,000537 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life
spin
nuclear quadrupole moment
dema îcadkirinê yan keşfê
parity

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

dîrok

kaşîf an îcadker	Known to the ancients.
location of discovery
dema îcadkirinê yan keşfê
Bêjenasî	Symbol from Latin: cuprum (island of Cyprus famed for its copper mines).
pronunciation	KOP-er (îngilîzî)

source

Abundance
Abundance in Earth's crust	60 mg/kg
natural abundance (Okyanûs)	0,00025 mg/L
natural abundance (human body)	0,0001 %
natural abundance (meteoroid)	0,011 %
natural abundance (Roj)	0,00007 %
Abundance in Universe	0,000006 %

Nuclear Screening Constants

1	s	0.6614
2	p	3.903
2	s	7.9802
3	d	15.7994
3	p	14.2694
3	s	13.4057
4	s	23.1576

Sifir on ChemicalAid

ABC News topic ID	copper
AGROVOC ID	c_1868
Art & Architecture Thesaurus ID	300011020
Australian Educational Vocabulary ID	scot/3512
BNCF Thesaurus ID	2735
Biblioteca Nacional de España ID	XX530125
Bibliothèque nationale de France ID	119470591
Brockhaus Enzyklopädie online ID	kupfer-20
CAS Registry Number	7440-50-8
Canadian Encyclopedia article ID	copper
ChEBI ID	30052
ChEMBL ID	CHEMBL55643
ChemSpider ID	22414
CosIng number	32826
DSSTOX compound identifier	DTXCID503985
DSSTox substance ID	DTXSID2023985
Den Store Danske ID	kobber
DrugBank ID	09130
ECHA Substance Infocard ID	100.028.326
Encyclopedia of China (Third Edition) ID	190458
Encyclopædia Britannica Online ID	science/copper
Encyclopædia Universalis ID	cuivre
EuroVoc ID	316
Europeana Fashion Vocabulary ID	10548
Freebase ID	/m/025rsfk
French Vikidia ID	Cuivre
GND ID	4033734-0
Gran Enciclopèdia Catalana ID	0226407
Great Russian Encyclopedia Online ID	2198522
Grove Art Online ID	T019343
HSDB ID	1622
ICSC ID	0240
IEDB Epitope ID	174839
InChI	InChI=1S/Cu
InChIKey	RYGMFSIKBFXOCR-UHFFFAOYSA-N
Italian Vikidia ID	Rame
KBpedia ID	Copper
KEGG ID	C00070
Klexikon article ID	Kupfer
Krugosvet article	himiya/med
Latvian National Encyclopedia Online ID	154602
Le Monde diplomatique subject ID	sujet/cuivre
Library of Congress authority ID	sh85032278
LiverTox ID	Copper
MeSH descriptor ID	D003300
NALT ID	28946
NDF-RT ID	N0000146034
NDL Authority ID	00561504
NKCR AUT ID	ph123121
Namuwiki ID	구리
National Library of Israel J9U ID	987007562861205171
OmegaWiki Defined Meaning	761
OpenAlex ID	C2991729501
OpenAlex ID	C544778455
Open Food Facts ingredient ID	copper
PACTOLS thesaurus ID	pcrt16pnvNar4g
PM20 ware ID	143156
PSH ID	5785
Probes And Drugs ID	PD013430
PubChem CID	23978
Quora topic ID	Copper-element
RKD thesaurus ID	43430
RxNorm ID	2837
Römpp online ID	RD-11-02420
STW Thesaurus for Economics ID	14299-5
Spanish Cultural Heritage thesauri ID	materias/1181267
Spanish Vikidia ID	Cobre
Store medisinske leksikon ID	kobber
Store norske leksikon ID	kobber
Treccani ID	rame
U.S. National Archives Identifier	10638044
UK Archival Thesaurus ID	f2/mt225/4347/1213
UK Parliament thesaurus ID	9416
UMLS CUI	C0009968
UNESCO Thesaurus ID	concept5524
UNII	789U1901C5
USGS Thesaurus ID	1434
WikiSkripta ID	12119
Wolfram Language entity code	Entity["Mineral", "Copper"]
WordNet 3.1 Synset ID	14659900-n
YSO ID	19074
ZVG number	8240
Zhihu topic ID	19659734

Sifir (Cu)

Physical Property

Chemical Property

other

Isotopes of Copper

52Cu

53Cu

54Cu

55Cu

56Cu

57Cu

58Cu

59Cu

60Cu

61Cu

62Cu

63Cu

64Cu

65Cu

66Cu

67Cu

68Cu

69Cu

70Cu

71Cu

72Cu

73Cu

74Cu

75Cu

76Cu

77Cu

78Cu

79Cu

80Cu

81Cu

82Cu

83Cu

84Cu

dîrok

source

Nuclear Screening Constants

⁵²Cu

⁵³Cu

⁵⁴Cu

⁵⁵Cu

⁵⁶Cu

⁵⁷Cu

⁵⁸Cu

⁵⁹Cu

⁶⁰Cu

⁶¹Cu

⁶²Cu

⁶³Cu

⁶⁴Cu

⁶⁵Cu

⁶⁶Cu

⁶⁷Cu

⁶⁸Cu

⁶⁹Cu

⁷⁰Cu

⁷¹Cu

⁷²Cu

⁷³Cu

⁷⁴Cu

⁷⁵Cu

⁷⁶Cu

⁷⁷Cu

⁷⁸Cu

⁷⁹Cu

⁸⁰Cu

⁸¹Cu

⁸²Cu

⁸³Cu

⁸⁴Cu