Platinum

Statistics:

• Name: Platinum
• Symbol: Pt
• Classification: Transition Metal
• Atomic Number: 78
• Atomic Mass: 195.084 g/mol
• Density: 21.45 g/cm³
• Melting: 1772°C
• Boiling: 3827°C
• Protons & Electrons:78
• Neutrons:117
• Discovered: 1557
• Discovered By: Scaliger
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Electrons Per Energy Level:

• Level 1: 2
• Level 2: 8
• Level 3: 18
• Level 4: 32
• Level 5: 17
• Level 6: 1

Isotopes:

Isotope: Half-life

• ¹⁸⁸Pt: 10.2 days
• ¹⁹⁰Pt: 6.5e11 years
• ¹⁹¹Pt: 2.802 days
• ¹⁹²Pt: stable
• ¹⁹³Pt: 50 years
• ^193m1Pt: 4.33 days
• ¹⁹⁴Pt: stable
• ¹⁹⁵Pt: stable
• ¹⁹⁵Pt: 4.02 days
• ¹⁹⁶Pt: stable
• ¹⁹⁷Pt: 19.8915 hours
• ^197m1Pt: 95.41 minutes
• ¹⁹⁸Pt: stable

Brief Summary

Platinum is a Transition Metal with the symbol 'Pt' and contains 78 Protons & Electrons with 117 neutrons in the nucleus of the atom. Platinum has an atomic mass of 195.084 g/mol and, at a temperature of 20°C, has a density of 21.45 g/cm³. It will melt at a temperature of 1772°C and boil at 3827°C.

Platinum was discovered by Scaliger in 1557 and is named 'Platinum' Spanish word "platina" meaning "little silver".

Some common usages for Platinum: jewelry, containers, catalyst.

Definitions and Notes

Density listed is at a temperature of 20°C.

Isotopes are forms of an element who have the same atomic number but different mass because they contain different number of neutrons.

Half-life is the time required for a quantity of a subject to fall to half of its current quantity.

MLA Citing Format

Platinum :: Pt :: 78 - Chemical Element. 22 Nov. 2008 <http://www.chemicalelement.com/element/platinum.html>.