Name Platinum
Symbol Pt
Atomic Number 78
Atomic Mass 195.078 atomic mass units
Number of Protons 78
Number of Neutrons 117
Number of Electrons 78
Melting Point 1772.0 C
Boiling Point 3827.0 C
Density 21.45 grams per cubic centimeter
Normal Phase Solid
Family Transition Metals
Period 6
Cost Varies greatly:
$561 per ounce
$4700 per 100 grams



Origin of Name From the Spanish word platina, meaning little silver
Date and Place of Discovery In 1557 in Central America between Darien and Mexico
Discovered by In writings of Julius Caesar Scaliger
Common Compounds
Interesting facts
  • It is the rarest of the precious metals.
  • It is produced commercially as a by product of nickel ore processing in the Sudbury Basin in Ontario, Canada.
  • It is highly resistant to chemical attack.
  • It has stable electrical properties.
  • It does not oxidize in air at any temperature.
  • It will corrode when exposed to cyanides, halogens, sulfur, or caustic alkalis.
Common Uses
  • Gasoline
  • Hard disk drives
  • Anti-cancer drugs
  • Fiber-optic cables
  • LCD displays
  • Eyeglasses
  • Fertilizers
  • Explosives
  • Paints
  • Pacemakers
  • Catalyst in fuel cells
  • Catalytic converters
  • Jewelry
  • Missile nose cones
  • Dentistry
  • Chemo-therapy


Photo Courtesy of
Chemical Elements
Mrs. Purdy's Web Page
Web Elements

Platinum Atomic Structure Elements by Name Elements by Number Home