"Pe̍h-kim" pán-pún chi-kan bô-kāng--ê tē-hng

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{{Infobox element
[[File:Platinum crystals.jpg|thumb|Pe̍h-kim]]
|name=Pe̍h-kim
 
|number=78
|symbol=Pt
|enname=platinum
|left=[[iridium]]
|right=[[kim]]
|above=[[palladium|Pd]]
|below=[[darmstadtium|Ds]]
|series=kòe-tō͘ kim-sio̍k
|group=10
|period=6
|block=d
[[File:|image name=Platinum crystals.jpg|thumb|Pe̍h-kim]]
|appearance=silvery white
|atomic mass=195.084
|atomic mass ref=<ref name="IUPAC">[http://www.ciaaw.org/atomic-weights.htm Standard Atomic Weights 2013]. [[Commission on Isotopic Abundances and Atomic Weights]]</ref>
|atomic mass 2=9
|atomic mass comment=
|electron configuration=&#91;[[xenon|Xe]]&#93; 4f<sup>14</sup> 5d<sup>9</sup> 6s<sup>1</sup>
|electrons per shell=2, 8, 18, 32, 17, 1
|phase=kò͘-thé
|density gpcm3nrt=21.45
|density gpcm3mp=19.77
|melting point K=2041.4
|melting point C=1768.3
|melting point F=3214.9
|boiling point K=4098
|boiling point C=3825
|boiling point F=6917
|heat fusion=22.17
|heat vaporization=510
|heat capacity=25.86
|vapor pressure 1=2330
|vapor pressure 10=(2550)
|vapor pressure 100=2815
|vapor pressure 1 k=3143
|vapor pressure 10 k=3556
|vapor pressure 100 k=4094
|vapor pressure comment=
|crystal structure=face-centered cubic
|oxidation states=6, 5, '''4''', 3, '''2''', 1, −1, −2, −3
|oxidation states comment=(a&nbsp;mildly [[base (chemistry)|basic]] oxide)
|electronegativity=2.28
|number of ionization energies=2
|ionization energy 1=870
|ionization energy 2=1791
|atomic radius=139
|covalent radius=136±5
|Van der Waals radius=175
|magnetic ordering=[[paramagnetism|paramagnetic]]
|electrical resistivity unit prefix=n
|electrical resistivity at 20=105
|thermal conductivity=71.6
|thermal expansion at 25=8.8
|speed of sound rod at r.t.=2800
|tensile strength=125&ndash;240
|Young's modulus=168
|Shear modulus=61
|Bulk modulus=230
|Poisson ratio=0.38
|Mohs hardness=3.5
|Vickers hardness=400–550
|Brinell hardness= 300–500
|CAS number=7440-06-4
|isotopes=
{{infobox element/isotopes decay | mn=190 | sym=Pt
| na=0.014% | hl=6.5&times;10<sup>11</sup>&nbsp;y
| dm=[[alpha decay|α]] | de=3.252 | link1=osmium-186 | pn=186 | ps=Os}}
{{infobox element/isotopes decay | mn=192 | sym=Pt | na=0.782% | hl=>4.7×10<sup>16</sup>&nbsp;y
| dm=(α) |de=2.4181 | link1=osmium-188 | pn=188 | ps=Os}}
{{infobox element/isotopes decay | mn=193 | sym=Pt
| na=[[synthetic radioisotope|syn]] | hl=50&nbsp;y
| dm=[[electron capture|ε]] | de=– | link1=iridium-193 | pn=193 | ps=Ir}}
{{infobox element/isotopes decay | mn=194 | sym=Pt | na=32.967% | hl=– | dm=(α) | de=1.5045 | link1=osmium-190 | pn=190 | ps=Os }}
{{infobox element/isotopes decay | mn=195 | sym=Pt | na=33.832% | hl=– | dm=(α) | de=1.1581 | link1=osmium-191 | pn=191 | ps=Os }}
{{infobox element/isotopes decay | mn=196 | sym=Pt | na=25.242% | hl=– | dm=(α) | de=0.7942 | link1=osmium-192 | pn=192 | ps=Os }}
{{infobox element/isotopes decay2 | mn=198 | sym=Pt | na=7.163% | hl=>3.2×10<sup>14</sup>&nbsp;y
| dm1=(α) |de1=0.0870 | link1=osmium-194 | pn1=194 | ps1=Os
| dm2=([[double beta decay|β<sup>−</sup>β<sup>−</sup>]]) | de2=1.0472 | link2=mercury-198 | pn2=198 | ps2=Hg}}
|isotopes comment=Decay modes in parentheses are predicted, but have not yet been observed
|discovery and first isolation by=[[Antonio de Ulloa]]
|discovery date=1735
}}
'''Pe̍h-kim''' sī chi̍t khoán [[kim-sio̍k]] lūi ê [[hoà-ha̍k goân-sò͘]], kì-hō '''Pt''', [[goân-chú-hoan]] 78.