Zinc
Chemical element with atomic number 30Àdàkọ:SHORTDESC:Chemical element with atomic number 30
Zinc, 30 Zn Zinc Ìhànsójú silvery gray Ìwúwo átọ̀mù A r, std (Zn) 65.38(2) [1] Zinc ní orí tábìlì àyè
Nọ́mbà átọ̀mù (Z ) 30 Ẹgbẹ́ group 12 Àyè àyè 4 Àdìpọ̀ Àdìpọ̀-d Ẹ̀ka ẹ́límẹ́ntì Post-transition metalÌtò ẹ̀lẹ́ktrọ́nù [Ar ] 3d10 4s2 Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan 2, 8, 18, 2 Àwọn ohun ìní ara Ìfarahàn at STP solid Ìgbà ìyọ́ 692.68 K (419.53 °C, 787.15 °F) Ígbà ìhó 1180 K (907 °C, 1665 °F) Kíki (near r.t. ) 7.14 g/cm3 when liquid (at m.p. ) 6.57 g/cm3 Heat of fusion 7.32 kJ/mol Heat of 123.6 kJ/mol Molar heat capacity 25.470 J/(mol·K) pressure
P (Pa)
1
10
100
1 k
10 k
100 k
at T (K)
610
670
750
852
990
1179
Atomic properties Oxidation states −2, 0, +1, +2 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment Electronegativity Pauling scale: 1.65 energies Atomic radius empirical: 134 pm Covalent radius 122±4 pm Van der Waals radius 139 pm Color lines in a spectral range Spectral lines of zinc Other properties Natural occurrence primordial Crystal structure hexagonal Speed of sound thin rod (rolled) 3850 m/s (at r.t. ) Thermal expansion 30.2 µm/(m·K) (at 25 °C) Thermal conductivity 116 W/(m·K) Electrical resistivity 59.0 n Ω·m (at 20 °C) Magnetic ordering diamagnetic Young's modulus 108 GPa Shear modulus 43 GPa Bulk modulus 70 GPa Poisson ratio 0.25 Mohs hardness 2.5 Brinell hardness 412 MPa CAS Number 7440-66-6 Main isotopes of zinc
Isotope
Abundance
Half-life (t 1/2 )
Decay mode
Product
64 Zn
48.6%
64 Zn is stable with 34 neutrons
65 Zn
syn
243.8 d
ε
1.3519
65 Cu
γ
1.1155
-
66 Zn
27.9%
66 Zn is stable with 36 neutrons
67 Zn
4.1%
67 Zn is stable with 37 neutrons
68 Zn
18.8%
68 Zn is stable with 38 neutrons
Àdàkọ:Elementbox isotopes decay2 2hl
70 Zn
0.6%
70 Zn is stable with 40 neutrons
Àdàkọ:Elementbox isotopes decay2 2hl
72 Zn
syn
46.5 h
β−
0.458
72 Ga
Àdàkọ:Category-inline | references
Itokasi
↑ Meija, Juris; Coplen, Tyler B.; Berglund, Michael; Brand, Willi A.; De Bièvre, Paul; Gröning, Manfred; Holden, Norman E.; Irrgeher, Johanna et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry 88 (3): 265–91. doi:10.1515/pac-2015-0305 .
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