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.
Atomic number: 78
Atomic weight: 195.08
Group, period, block: 10, 6, d
Color: grayish white
Classification: transition metal
Electron configuration: 4f14 5d9 6s1
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
Oxidation states: 6, 5, 4, 3 , 2, 1, -1, -2, -3
Electronegativity: 2.28 (Pauling scale)
Ionization energies: 1st: 870 kJ·mol-1
Covalent radius: 136±5 pm
Van der Waals radius: 175 pm
There are six naturally occurring isotopes of platinum exist, 190Pt, 192Pt, 194Pt, 195Pt, 196Pt, and 198Pt.
190Pt is radioactive isotope.