Platinum (Pt) - Element 78 | Properties & Electron Configuration
What is Platinum?
Platinum (Pt) is element 78, a transition metal in period 6, group 10. Its electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁹ 6s¹.
| Atomic Number | 78 |
| Symbol | Pt |
| Atomic Mass | 195.08 u |
| Category | Transition Metal |
| Period | 6 |
| Group | 10 |
| Block | d |
| Electron Configuration | 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁹ 6s¹ |
| Short Config | [Xe] 4f¹⁴ 5d⁹ 6s¹ |
| Electronegativity | 2.28 |
| Atomic Radius | 135 pm |
| Ionization Energy | 870 kJ/mol |
| Electron Affinity | 205 kJ/mol |
| Phase (STP) | Solid |
Electron Configuration
The full electron configuration of Platinum is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁹ 6s¹. In noble gas shorthand, this is written as [Xe] 4f¹⁴ 5d⁹ 6s¹.
Platinum is a d-block element in group 10, period 6.
Periodic Trends
Electronegativity: Platinum has a Pauling electronegativity of 2.28. Within group 10, electronegativity generally decreases down the group.
Atomic Radius: 135 pm. Across period 6, atomic radius generally decreases left to right as nuclear charge increases.
Ionization Energy: 870 kJ/mol. Ionization energy generally increases across a period and decreases down a group.
View all 118 elements with trend overlays for electronegativity, atomic radius, ionization energy, and electron affinity.
Explore Platinum on the Interactive Periodic TableRelated Topics
Nickel (Ni)
Properties of Nickel - same group as Platinum
Palladium (Pd)
Properties of Palladium - same group as Platinum
Darmstadtium (Ds)
Properties of Darmstadtium - same group as Platinum
Cesium (Cs)
Properties of Cesium - same period as Platinum
Barium (Ba)
Properties of Barium - same period as Platinum
Lanthanum (La)
Properties of Lanthanum - same period as Platinum