Zinc, 30Zn
Zinc
Appearancesilver-gray
Standard atomic weight Ar°(Zn)
Zinc in the periodic table
Hydrogen Helium
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Zn

Cd
copperzincgallium
Atomic number (Z)30
Groupgroup 12
Periodperiod 4
Block  d-block
Electron configuration[Ar] 3d10 4s2
Electrons per shell2, 8, 18, 2
Physical properties
Phase at STPsolid
Melting point692.68 K ​(419.53 °C, ​787.15 °F)
Boiling point1180 K ​(907 °C, ​1665 °F)
Density (at 20° C)7.140 g/cm3[3]
when liquid (at m.p.)6.57 g/cm3
Heat of fusion7.32 kJ/mol
Heat of vaporization115 kJ/mol
Molar heat capacity25.470 J/(mol·K)
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 610 670 750 852 990 1179
Atomic properties
Oxidation statescommon: +2
−2,[4] 0,? +1[5]
ElectronegativityPauling scale: 1.65
Ionization energies
  • 1st: 906.4 kJ/mol
  • 2nd: 1733.3 kJ/mol
  • 3rd: 3833 kJ/mol
  • (more)
Atomic radiusempirical: 134 pm
Covalent radius122±4 pm
Van der Waals radius139 pm
Color lines in a spectral range
Spectral lines of zinc
Other properties
Natural occurrenceprimordial
Crystal structurehexagonal close-packed (hcp) (hP2)
Lattice constants
Hexagonal close packed crystal structure for zinc
a = 266.46 pm
c = 494.55 pm (at 20 °C)[3]
Thermal expansion30.08×10−6/K (at 20 °C)[a]
Thermal conductivity116 W/(m⋅K)
Electrical resistivity59.0 nΩ⋅m (at 20 °C)
Magnetic orderingdiamagnetic
Molar magnetic susceptibility−11.4×10−6 cm3/mol (298 K)[6]
Young's modulus108 GPa
Shear modulus43 GPa
Bulk modulus70 GPa
Speed of sound thin rod3850 m/s (at r.t.) (rolled)
Poisson ratio0.25
Mohs hardness2.5
Brinell hardness327–412 MPa
CAS Number7440-66-6
History
DiscoveryIndian metallurgists (before 1000 BCE)
First isolationAndreas Sigismund Marggraf (1746)
Recognized as a unique metal byRasaratna Samuccaya (1300)
Isotopes of zinc
Main isotopes[7] Decay
abun­dance half-life (t1/2) mode pro­duct
64Zn 49.2% stable
65Zn synth 244 d β+ 65Cu
66Zn 27.7% stable
67Zn 4% stable
68Zn 18.5% stable
69Zn synth 56 min β 69Ga
69mZn synth 13.8 h β 69Ga
70Zn 0.6% stable
71Zn synth 2.4 min β 71Ga
71mZn synth 4 h β 71Ga
72Zn synth 46.5 h β 72Ga
 Category: Zinc
| references
Zn · Zinc
Cu ←

ibox Cu

iso
30
Zn  [e]
IB-Zn [e]
IBisos [e]
→ Ga

ibox Ga

indexes by PT (page)
child table, as reused in {IB-Zn}
Main isotopes of zinc
Main isotopes[7] Decay
abun­dance half-life (t1/2) mode pro­duct
64Zn 49.2% stable
65Zn synth 244 d β+ 65Cu
66Zn 27.7% stable
67Zn 4% stable
68Zn 18.5% stable
69Zn synth 56 min β 69Ga
69mZn synth 13.8 h β 69Ga
70Zn 0.6% stable
71Zn synth 2.4 min β 71Ga
71mZn synth 4 h β 71Ga
72Zn synth 46.5 h β 72Ga
Data sets read by {{Infobox element}}
Name and identifiers
Symbol etymology (11 non-trivial)
Top image (caption, alt)
Pronunciation
Allotropes (overview)
Group (overview)
Period (overview)
Block (overview)
Natural occurrence
Phase at STP
Oxidation states
Spectral lines image
Electron configuration (cmt, ref)
Isotopes
Standard atomic weight
  most stable isotope
Wikidata
Wikidata *
* Not used in {{Infobox element}} (2023-01-01)
See also {{Index of data sets}} · Cat:data sets (46) · (this table: )

Notes

  1. ^ The thermal expansion of zinc is anisotropic. The coefficients for each crystal axis are (at 20 °C): αa = 13.06×10−6/K, αc = 64.12×10−6/K, and αaverage = αvolume/3 = 30.08×10−6/K.

References

  1. ^ "Standard Atomic Weights: Zinc". CIAAW. 2007.
  2. ^ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
  3. ^ a b Arblaster, John W. (2018). Selected Values of the Crystallographic Properties of Elements. Materials Park, Ohio: ASM International. ISBN 978-1-62708-155-9.
  4. ^ Zn(−2) have been observed (as dimeric and monomeric anions; dimeric ions were initially reported to be [T–T]2−, but later shown to be [T–T]4− for all these elements) in Ca5Zn3 (structure (AE2+)5(T–T)4−T2−⋅4e); see Changhoon Lee; Myung-Hwan Whangbo (2008). "Late transition metal anions acting as p-metal elements". Solid State Sciences. 10 (4): 444–449. Bibcode:2008SSSci..10..444K. doi:10.1016/j.solidstatesciences.2007.12.001. and Changhoon Lee; Myung-Hwan Whangbo; Jürgen Köhler (2010). "Analysis of Electronic Structures and Chemical Bonding of Metal-rich Compounds. 2. Presence of Dimer (T–T)4– and Isolated T2– Anions in the Polar Intermetallic Cr5B3-Type Compounds AE5T3 (AE = Ca, Sr; T = Au, Ag, Hg, Cd, Zn)". Zeitschrift für Anorganische und Allgemeine Chemie. 636 (1): 36–40. doi:10.1002/zaac.200900421.
  5. ^ Zn(I) has been reported in decamethyldizincocene; see Resa, I.; Carmona, E.; Gutierrez-Puebla, E.; Monge, A. (2004). "Decamethyldizincocene, a Stable Compound of Zn(I) with a Zn-Zn Bond". Science. 305 (5687): 1136–8. Bibcode:2004Sci...305.1136R. doi:10.1126/science.1101356. PMID 15326350. S2CID 38990338.
  6. ^ Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.
  7. ^ a b Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.