Palladium (Pd)
Element 46 · Transition metal · Solid at 25 °C · Group 10, Period 5
Palladium is the workhorse of catalytic converters and a remarkable hydrogen sponge, able to absorb hundreds of times its own volume of the gas.
On the periodic table, palladium sits in group 10 in period 5. It is one of 38 elements classified as a transition metal, and at room temperature (25 °C) it is a solid.
Transition metals occupy the wide d-block in the middle of the table. As a family they are hard, dense, high-melting metals that conduct heat and electricity well. Their partly filled d-orbitals let many of them take several oxidation states, form vividly colored compounds, and act as catalysts — which is why so much of industry, and so much of biology, runs on this block.
Properties of palladium
| Atomic number (Z) | 46 |
|---|---|
| Symbol | Pd |
| Atomic mass | 106.42 |
| Category | Transition metal |
| Group | 10 |
| Period | 5 |
| Block | d-block |
| Metal / nonmetal | Metal |
| State at 25 °C | Solid |
| Electron configuration | [Kr] 4d10 |
| Electronegativity (Pauling) | 2.2 |
| Melting point | 1,554.9 °C (1,828.05 K / 2,830.82 °F) |
| Boiling point | 2,963 °C (3,236.15 K / 5,365.4 °F) |
| Density | 12.023 g/cm³ |
Position in the periodic table
Palladium shares group 10 with Nickel (Ni), Platinum (Pt), Darmstadtium (Ds). Elements in the same group have the same number of outer electrons, so they tend to behave alike chemically — comparing them is one of the fastest ways to see periodic trends in action.
Physical properties
Palladium melts at 1,554.9 °C (1,828.05 K / 2,830.82 °F) and boils at 2,963 °C (3,236.15 K / 5,365.4 °F), giving it a liquid range of about 1,408.1 °C at standard pressure.
Its density is 12.023 g/cm³.
See also: the interactive periodic table, how to read the periodic table, periodic trends.