Platinum
Chemical element with atomic number 78Àdàkọ:SHORTDESC:Chemical element with atomic number 78
Platinum, 78 Pt Platinum Pípè / ˈ p l æ t ᵻ n ə m / (PLAT -ə-nəm ) Ìhànsójú grayish white Ìwúwo átọ̀mù A r, std (Pt) 195.084(9) [1] Platinum ní orí tábìlì àyè
Nọ́mbà átọ̀mù (Z ) 78 Ẹgbẹ́ group 10 Àyè àyè 6 Àdìpọ̀ Àdìpọ̀-d Ẹ̀ka ẹ́límẹ́ntì Transition metalÌtò ẹ̀lẹ́ktrọ́nù [Xe ] 4f14 5d9 6s1 Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan 2, 8, 18, 32, 17, 1 Àwọn ohun ìní ara Ìfarahàn at STP solid Ìgbà ìyọ́ 2041.4 K (1768.3 °C, 3214.9 °F) Ígbà ìhó 4098 K (3825 °C, 6917 °F) Kíki (near r.t. ) 21.45 g/cm3 when liquid (at m.p. ) 19.77 g/cm3 Heat of fusion 22.17 kJ/mol Heat of 469 kJ/mol Molar heat capacity 25.86 J/(mol·K) pressure
P (Pa)
1
10
100
1 k
10 k
100 k
at T (K)
2330
(2550)
2815
3143
3556
4094
Atomic properties Oxidation states −3, −2, −1, 0, +1, +2 , +3, +4 , +5, +6 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment Electronegativity Pauling scale: 2.28 Atomic radius empirical: 139 pm Covalent radius 136±5 pm Van der Waals radius 175 pm Color lines in a spectral range Spectral lines of platinum Other properties Natural occurrence primordial Crystal structure (fcc) Thermal expansion 8.8 µm/(m·K) (at 25 °C) Thermal conductivity 71.6 W/(m·K) Electrical resistivity 105 n Ω·m (at 20 °C) Magnetic ordering paramagnetic Young's modulus 168 GPa Shear modulus 61 GPa Bulk modulus 230 GPa Poisson ratio 0.38 Mohs hardness 4–4.5 Vickers hardness 549 MPa Brinell hardness 392 MPa CAS Number 7440-06-4 Main isotopes of platinum
Isotope
Abundance
Half-life (t 1/2 )
Decay mode
Product
190 Pt
0.014%
6.5×1011 y
α
3.18
186 Os
191 Pt
syn
2.76 d
ε
?
191 Ir
192 Pt
0.782%
192 Pt is stable with 114 neutrons
193 Pt
syn
50 y
ε
?
193 Ir
193m Pt
syn
4.33 d
IT
0.1355e
193 Pt
194 Pt
32.967%
194 Pt is stable with 116 neutrons
195 Pt
33.832%
195 Pt is stable with 117 neutrons
195m Pt
syn
4.02 d
IT
0.1297e
195 Pt
196 Pt
25.242%
196 Pt is stable with 118 neutrons
197 Pt
syn
19.8913 h
β−
0.719
197 Au
197m Pt
syn
1.59 h
IT
0.3465
197 Pt
198 Pt
7.163%
198 Pt is stable with 120 neutrons
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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