Difference Between Palladium and Platinum

Main Difference – Palladium vs Platinum

Palladium and platinum are often confusing because of their similar appearances. Both are shiny silvery-white metals. These metals are in the platinum group metals (PGM) which include palladium, rhodium, ruthenium, osmium, iridium, and platinum. Both palladium and platinum are transition metals and have the same electronegativity. But their chemical properties are different from each other. The main difference between palladium and platinum is that palladium has the least density and melting point among PGM elements whereas platinum has a considerably high density and a high melting point.

Key Areas Covered

1. What is Palladium
     – Definition, Chemical Properties, Uses
2. What is Platinum
     – Definition, Chemical Properties, Uses
3. What is the Difference Between Palladium and Platinum
     – Comparison of Key Differences

Key Terms: Acids, Atomic Number, Aqua Regia, Corrosion Resistance, Density, Melting Point, Palladium, Platinum, Platinum Group Metals

Difference Between Palladium and Platinum - Comparison Summary

What is Palladium

Palladium is a chemical element with the symbol Pd and atomic number 46. It is a shiny silvery-white metal. At room temperature and pressure, it is in the solid phase. Palladium is resistant to corrosion from air and acids at ordinary temperatures.

Chemical Properties of Palladium

Some chemical properties of Palladium are given below.

  • Atomic number – 46
  • Atomic mass – 106.42 g/mol
  • Electron configuration – [Kr] 4d10
  • Group – 10
  • Period – 5
  • Block – d (transition metal)
  • Melting point – 8°C
  • Boiling point – 2963°C
  • Electronegativity – 2.2 (Pauling scale)
  • Density – 12.0 g/cm3
Main Difference - Palladium vs Platinum

Figure 1: Palladium

Palladium, along with rhodium, ruthenium, osmium, iridium, and platinum, is called the platinum group metals (PGM). The appearance of palladium is very similar to that of platinum. Palladium has the least density and melting point among other chemical elements of platinum group metals.

Palladium has the “face-centered cubic” crystalline structure where the unit cell is in the shape of a cube. Although palladium is corrosion resistant to some extent, it is attacked by hot acids such as concentrated nitric acid, sulfuric acid, etc. Palladium may dissolve in aqua regia (a mixture of nitric acid and hydrochloric acid).

Palladium does not tarnish when exposed to air since it does not react with oxygen at standard temperature. But in a moist atmosphere containing sulfur, palladium tarnishes lightly.

Applications of Palladium

The applications of palladium include followings.

  • Used as a catalyst (finely divided palladium is used to speed up hydrogenation, dehydrogenation and petroleum cracking reactions)
  • Used in low voltage electrical contacts (due to the corrosion resistance)
  • Jewelry making (form alloys named “white gold” – alloy with platinum)
  • To make watch bearings, mirrors in scientific instruments, springs, etc.
  • Used as catalytic converters for cars (to reduce emissions from car exhaust)
  • Electroplating (palladium salts are used)

What is Platinum

Platinum is a chemical element with the symbol Pt and atomic number 78. It has a shiny silvery-white appearance. It is highly unreactive like gold and is highly resistant to corrosion. Platinum is a member of the platinum group metals.

Chemical Properties of Platinum

Some chemical properties of platinum are listed below.

  • Atomic number – 78
  • Atomic mass – 195.084 g/mol
  • Electron configuration – [Xe] 4f145d96s1
  • Group – 10
  • Period – 6
  • Block – d (transition metal)
  • Melting point – 2°C
  • Boiling point – 3825°C
  • Electronegativity – 2.2 (Pauling scale)
  • Density – 21.5 g/cm3
Difference Between Palladium and Platinum

Figure 2: Platinum

Platinum is found in alluvial deposits as the free metal (uncombined). Platinum is one of the least reactive metals.

Pure platinum is ductile, malleable and lustrous. When compared with gold and silver, platinum is more ductile but less malleable. Platinum resists reacting with concentrated nitric and hydrochloric acids but is dissolved in hot aqua regia (a mixture of nitric acid and hydrochloric acid).

Applications of Platinum

Some applications of platinum are listed below.

  • As jewellery (due to its strength and resistance to tarnish)
  • As a catalytic converter for cars, trucks and buses (due to the efficiency of converting emissions from the vehicle’s engine into less harmful waste products.
  • As a catalyst for the production of nitric acid, silicone and benzene
  • As wires used for electrodes
  • For medical uses (platinum compounds are used as chemotherapy drugs)

Difference Between Palladium and Platinum

Definition

Palladium: Palladium is a chemical element with the symbol Pd and atomic number 46.

Platinum: Platinum is a chemical element with the symbol Pt and atomic number 78.

Atomic Number

Palladium: Atomic number of palladium is 46.

Platinum: Atomic number of platinum is 78.

Atomic Mass

Palladium: Atomic mass of palladium is 106.42 g/mol.

Platinum: Atomic mass of platinum is 195.084 g/mol

Melting Point

Palladium: The melting point of palladium is 1554.8°C.

Platinum: The melting point of platinum is 1768.2°C

Density

Palladium: The density of palladium is about 12.0 g/cm3.

Platinum: The density of palladium is about 21.5 g/cm3.

Period

Palladium: Palladium is in the period 5 of the periodic table of elements.

Platinum: Platinum is in the period 6 of the periodic table of elements.

Uses

Palladium: Palladium is used as catalysts, catalytic converters, for electroplating, jewelry making, etc.

Platinum: Platinum is used for jewelry making, as catalytic converters, catalysts, to make drugs in chemotherapy for cancers.

Conclusion

Palladium and platinum are very important metals that have a similar appearance. These metals have a wide variety of applications. Although they look similar, there are many chemical differences between them. The main difference between palladium and platinum is that palladium has the least density and melting point among PGM elements whereas platinum has a considerably high density and a high melting point.

Reference:

1. “Palladium – Element information, properties and uses | Periodic Table.” Royal Society of Chemistry,
2. “Water Treatment Solutions.” Lenntech Water treatment & purification, .
3. “Platinum – Element information, properties and uses | Periodic Table.” Royal Society of Chemistry,

Image Courtesy:

1. “Palladium (46 Pd)” By Hi- – via
2. “Platinum (Russia) 3 (17151299739)” By James St. John – Platinum (Russia) 3 via

About the Author: Madhusha

Madhusha is a BSc (Hons) graduate in the field of Biological Sciences and is currently pursuing for her Masters in Industrial and Environmental Chemistry. Her interest areas for writing and research include Biochemistry and Environmental Chemistry.

Leave a Comment


Related pages


multinational organisation definitionintrovert and extrovert differencewhat is the difference between rum and whiskystructure of ribose and deoxyribose sugaraldose sugarsan affix placed before a word or basemodernism versus postmodernismexamples of synesthesia in literatureexplain the difference between balanced and unbalanced forcesseries and parallel resonance circuitfiancee vs fiance meaningmrna in prokaryotes and eukaryoteswhat is the difference between coagulation and flocculationembryonic stem cells pluripotent or totipotentcytoplasm cytosolpermittivity definition physicsidiopathic hypersomnolencedifference in est and pstwhat is the difference between anxiety and panicpindaric ode examplepossessive adjective and possessive pronounwhat is angiosperms and gymnospermsdifferentiate primary succession from secondary successionpail bucketcyclone vs tornadowhat is the difference between cytoplasm and cytoskeletoneddys currentoxymoron vs paradoxmicrovilli functionredox titration definitioncyclone hurricane differencewhat is the difference between typical and atypicaldifference between russia and soviet unionwhat is the difference between an endnote and a footnotekinetic friction physics definitionnitrite chemical formulawhat is the definition of synapsishyperglycemia and hypoglycemia symptomswhat is a refrain in poetrypv of an annuity formuladefine thrombusexample of archetype in literaturedifference between xylem and phloemhow does ophelia die in hamletdifference between renewable and nonrenewable resourcesfunction of micropyle in seedverb form of beliefalumni plural or singularhobbies and interests differencesugar beets vs sugar caneoxymoron literary exampleshow can you tell the difference between copper and brasscyclone and tornadothe difference between dinner and supperdifference between constructive and destructivee coli klebsiellawhats maizedifference between adenine and guanineinterstate vs intrastate definitionmsc mba differencewhat is the difference between folktales and fairy talesdistinguish between values and ethicswhat is the chemical formula for maltodextrinconnotative and denotative meaningcpi formula calculationdeterminer adjectivedefinition of subordinating conjunctionstypes of epistemology in researchdefinition of modernism and postmodernismwhat are assonance and consonanceneurotic or psychoticdifference between tensile stress and compressive stresswhat is the difference between latino and latinasigns and symptoms of hyperglycemia vs hypoglycemialentils and pulses differencedifference between cafe and bistrodifference in alligator and crocodilewhat is the difference between anaphase i and anaphase iidyskinesia definitionnon metallic minerals definitiondistillation and fractional distillation differencewhat is the difference between marzipan and fondantosmotic pressure of blood plasmacompare and contrast mechanical and electromagnetic waves