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PLATINUM Symbol: Pt Atomic Mass: 195.084 Atomic Number: 78 Electrons: 78 Protons: 78 Neutrons: 117 Boiling Point: 3827.0 °C Melting Point: 1772.0 °C Freezing Point: 3222 °F Density: 2.14 g/cm3 Electronegativity: 2.28
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Platinum was first
discovered by Antonio de Ulloa and Jorge Juan in South America in 1735. It is obtained in pure form
from platinum ores. It comes from the Spanish word platina,
which means "little silver". It is used in jewelry,
containers, and as a catalyst. It is considered a precious metal.
Platinum is solid at room temperature. In its pure form it is
silver-white, malleable, and ductile. It was discovered in large
quantities in the Ural Mountains of Russia in 1822. |
 This is a diagram of an atom of platinum showing the nucleus and the electrons in orbitals
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This is a picture of platinum in its
natural ore form.