Periodic Table of Elements




Platinum was discribed by Julius Caesar Scaliger in 1557. This new metal was further observed during an expedition of New Grenada by Antonio de Ulloa and Don Jorge Juan y Santacilia in 1748. The origin of the name comes from the Spanish word platina meaning silver.

Name: Platinum
Symbol: Pt
Atomic number: 78
Atomic weight: 195.08
State: solid
Group, period, block: 10, 6, d
Color: grayish white
Classification: transition metal
Electron configuration: 4f14 5d9 6s1

Physical properties

Density: 21.45 g/cm-3
Melting point: 2041.4 K, 1768.3 C, 3214.9 F
Boiling point: 4098 K, 3825 C, 6917 F

Atomic properties

Oxidation states: 6, 5, 4, 3 , 2, 1, -1, -2, -3
Electronegativity: 2.28 (Pauling scale)
Ionization energies: 1st: 870 kJmol-1
Covalent radius: 1365 pm
Van der Waals radius: 175 pm
  • Pt
  • Electron Configuration


There are six naturally occurring isotopes of platinum exist, 190Pt, 192Pt, 194Pt, 195Pt, 196Pt, and 198Pt.
190Pt is radioactive isotope.