Platinum (Pt)
Platinum
Platinum (Pt) is a transition metal in period 6, group 10. Its relative atomic mass is 195.08 and the molar mass of the atom is 195.08 g/mol.
Atomic number 78
Atomic mass 195.08
Molar mass 195.08 g/mol
Category Transition metal Solid
Properties of platinum
| Atomic number | 78 |
|---|---|
| Symbol | Pt |
| Latin name | Platinum |
| Relative atomic mass | 195.08 |
| Molar mass | 195.08 g/mol |
| Group, period, block | 10, 6, d |
| Category | Transition metal |
| State at 20 °C | Solid |
| Electron configuration | [Xe] 4f¹⁴ 5d⁹ 6s¹ |
| Electronegativity (Pauling) | 2.28 |
| Atomic radius | 135 pm |
Electron configuration of platinum
Electrons per shell
K2L8M18N32O17P1
Full notation
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁹ 6s¹
Noble-gas notation
78 protons · 78 electrons[Xe] 4f¹⁴ 5d⁹ 6s¹
Formula and compounds of platinum
Simple substancePtplatinumMolar mass of Pt: 195.08 g/mol
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Frequently asked questions
The relative atomic mass of platinum is 195.08, so the molar mass of the atom is 195.08 g/mol.
Full: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁹ 6s¹. Noble-gas notation: [Xe] 4f¹⁴ 5d⁹ 6s¹.