![[ATOM]](atom.gif) |
Platinum
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Information valid for Pt-195 unless otherwise noted
Basic Information
Symbol: Pt
Atomic Number: 78
Mass: 195.078
Melting Point: 1772.0 C
Boiling Point: 3827.0 C
Number of Protons/Electrons: 78
Number of Neutrons: 117
Classification: Transition Metal
Crystal Structure: Cubic
Density @ 293 K: 21.45 g/cm3
Color: silverish
Atomic Structure
![[Bohr Model of Platinum]](b0078.gif) |
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Number of Energy Levels: 6
First Energy Level: 2
Second Energy Level: 8
Third Energy Level: 18
Fourth Energy Level: 32
Fifth Energy Level: 17
Sixth Energy Level: 1
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Isotopes
| Isotope |
Half Life |
| Pt-188 |
10.2 days |
| Pt-190 |
6.0E11 years |
| Pt-191 |
2.96 days |
| Pt-192 |
Stable |
| Pt-193 |
60.0 years |
| Pt-193m |
4.33 days |
| Pt-194 |
Stable |
| Pt-195 |
Stable |
| Pt-195m |
4.02 days |
| Pt-196 |
Stable |
| Pt-197 |
18.3 hours |
| Pt-197m |
1.59 hours |
| Pt-198 |
Stable |
Facts
Date of Discovery: 1735
Discoverer: Julius Scaliger
Name Origin: From the Spanish word platina (little silver)
Uses: jewelry, containers, catalyst
Obtained From: platinum ores