What Is Palladium?
Palladium is a chemical element with the symbol Pd and atomic number 46, found within the transition metal block of the periodic table.
A rare silvery-white metal. Can absorb up to 900 times its own volume of hydrogen.
As a transition metal in Period 5 and Group 10 (Transition Metals), palladium's placement on the table reflects its electron configuration of [Kr] 4d¹⁰, which governs its bonding behavior and the type of compounds it typically forms.
Position on the Periodic Table
Palladium is located in Period 5, which continues the transition metal pattern seen in Period 4 but one principal shell further out.
Within that row, palladium sits in Group 10 (Transition Metals), alongside elements that share a similar number of valence electrons and, by extension, similar chemical behavior.
This position is not arbitrary — the periodic table was deliberately organized so that an element's row and column reveal its expected reactivity, bonding pattern, and physical state at a glance.
Physical & Chemical Properties
Palladium has an atomic mass of 106.42 u and a density of 12.02 g/cm³. Its melting point is 1554.9°C and its boiling point is 2963°C.
As a transition metal, palladium conducts electricity and heat well, and its atoms pack into a metallic crystal lattice held together by shared, delocalized electrons.
Electron Configuration Explained
Palladium's electron configuration is [Kr] 4d¹⁰, describing how its electrons are distributed across shells and subshells around the nucleus.
Reading the configuration in order shows electrons filling shells of increasing energy, following the standard Aufbau principle that explains how atomic structure builds up across the periodic table.
The outermost (valence) electrons shown in this configuration are what ultimately determine palladium's chemical reactivity and the type of bonds it forms with other elements.
History & Discovery
Palladium was formally discovered in 1803, W.H. Wollaston, identified through the careful isolation and analytical techniques typical of that era's chemical research.
Many elements from this period were anticipated by Dmitri Mendeleev's periodic table, which successfully predicted gaps corresponding to undiscovered elements well before laboratory instruments existed to confirm them directly.
What Is Palladium Used For?
Palladium's specific properties make it useful in several applications, including:
- Catalytic converters
- Hydrogen purification
- Dentistry
- Jewelry
- Electronics
These uses reflect palladium's underlying classification as a transition metal, since the same properties that define its category in chemistry also determine where it becomes practically useful.
Fun Facts About Palladium
- Palladium can absorb 900 times its own volume of hydrogen — useful for hydrogen storage.
- Palladium is element number 46 on the periodic table, in Period 5 and Group 10.
- Its standard atomic mass is 106.42 u, calculated from the natural abundance of its isotopes.
Frequently Asked Questions
What is Palladium's atomic number?
Palladium has atomic number 46.
What is Palladium's chemical symbol?
Palladium's symbol is Pd.
What group and period is Palladium in?
Palladium is in Period 5, Group 10 (Transition Metals).
What is Palladium's atomic mass?
Palladium's standard atomic mass is 106.42 u.