78195.08PtPlatinum
Platinum (Pt) — element 78transition metal · group 10, period 6
Platinum is a chemical element with the symbol Pt and atomic number 78. It is a transition metal in group 10, period 6 of the periodic table (the d-block), with a standard atomic mass of 195.08 u. At room temperature (25 °C) platinum is a solid.
💡 Known for: A precious metal used in catalytic converters, jewellery, lab equipment and the cancer drug cisplatin.
# Platinum properties
| Symbol | Pt |
|---|---|
| Atomic number | 78 |
| Atomic mass | 195.08 u |
| Category | transition metal |
| Group | 10 |
| Period | 6 |
| Block | d-block |
| Electron configuration | [Xe] 4f¹⁴ 5d⁹ 6s¹ |
| Full configuration | 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁹ 6s¹ |
| Electrons per shell | 2, 8, 18, 32, 17, 1 |
| Protons / electrons | 78 / 78 |
| State at 25 °C | solid |
| Melting point | 2041.4 K (1768.2 °C, 3214.9 °F) |
| Boiling point | 4098 K (3824.8 °C, 6916.7 °F) |
| Density | 21.46 g/cm³ |
| Electronegativity (Pauling) | 2.28 |
| First ionization energy | 8.959 eV |
| Atomic radius | 177 pm |
| Discovered | 1735 |
# Electron configuration of platinum
The electron configuration of platinum is [Xe] 4f¹⁴ 5d⁹ 6s¹, written out in full as 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁹ 6s¹. Its 78 electrons fill 6 shells as 2, 8, 18, 32, 17, 1, so the outermost shell holds 1 electron.
# Related elements
IrIridiumprevious elementAuGoldnext elementNiNickelgroup 10PdPalladiumgroup 10DsDarmstadtiumgroup 10ScScandiumtransition metalTiTitaniumtransition metalVVanadiumtransition metalCrChromiumtransition metalMnManganesetransition metalFeIrontransition metalCoCobalttransition metalCuCoppertransition metal
# Platinum FAQ
What is the atomic number of platinum?
The atomic number of platinum is 78: every platinum atom has 78 protons in its nucleus. Its symbol is Pt.
What is the atomic mass of platinum?
The standard atomic mass of platinum is 195.08 u.
What is the electron configuration of platinum?
Platinum's electron configuration is [Xe] 4f¹⁴ 5d⁹ 6s¹ (1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁹ 6s¹), with 2, 8, 18, 32, 17, 1 electrons per shell.
Is platinum a metal?
Yes. Platinum is a transition metal, one of the metals.
What is the melting point of platinum?
Platinum melts at 2041.4 K (1768.2 °C, 3214.9 °F) and boils at 4098 K (3824.8 °C, 6916.7 °F).
What is platinum used for / known for?
A precious metal used in catalytic converters, jewellery, lab equipment and the cancer drug cisplatin.