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Platinum is a chemical element on the periodic table with the atomic symbol Pt, atomic number 78, and standard atomic weight 195.08 u. Classified as a Transition Metal within Group 10 and Period 6 (d-block), platinum possesses a ground-state electron configuration of [Xe] 4f¹⁴ 5d⁹ 6s¹ distributed across 6 concentric Bohr electron shells (2 · 8 · 18 · 32 · 17 · 1) with 1 outer-shell electrons. Noble d-block catalyst used in PEM hydrogen fuel cells and catalytic converters. Square-planar cis-diamminedichloroplatinum(II) (cisplatin) cross-links adjacent purine bases in DNA to halt cancer cell replication.

⚛️ Interactive Periodic Table Lab: Explore Platinum (Pt, Z = 78) in the CRV Science Dynamic Periodic Table & Bohr Orbital Lab to visualize its animated 2 · 8 · 18 · 32 · 17 · 1 electron shells, simulate live phase transitions from 0 K to 6,000 K, and compare periodic heatmaps across all 118 IUPAC elements.

Electron Shell Architecture and Ground-State Configuration

A neutral atom of platinum contains 78 protons in its atomic nucleus balanced by 78 electrons occupying quantized atomic orbitals. In the Bohr-Sommerfeld and quantum-mechanical orbital models, these electrons populate 6 principal energy shells (K (n=1): 2e⁻, L (n=2): 8e⁻, M (n=3): 18e⁻, N (n=4): 32e⁻, O (n=5): 17e⁻, P (n=6): 1e⁻), terminating in the four-lobed d-orbital manifold (azimuthal quantum number l = 2) with ground-state configuration [Xe] 4f¹⁴ 5d⁹ 6s¹. Removing the most loosely bound valence electron from an isolated gaseous platinum atom requires a first ionization energy of 870 kJ/mol, while its tendency to attract shared bonding electrons is quantified by a Pauling electronegativity of 2.28.

Periodic Table Position and Neighboring Elements

Within the periodic table, Platinum occupies Period 6, Group 10 of the d-block (Transition Metals). Along Period 6, it is flanked by Iridium (Ir, Z = 77) and Gold (Au, Z = 79). Vertically within its periodic family, Platinum shares valence orbital symmetry and homologous chemical trends with Nickel (Ni), Palladium (Pd), Darmstadtium (Ds). Learners can interactively compare Platinum's orbital radii, ionization energy, and Pauling electronegativity against all neighboring elements in the Dynamic Periodic Table Lab.

Standard Phase, Melting Point, and Boiling Point Dynamics

At standard ambient temperature and pressure (298.15 K / 25 °C, 1 atm), elemental platinum exists as a crystalline solid. As thermal energy increases, its crystal or molecular lattice undergoes solid-to-liquid fusion at a melting point of 2,041.4 K (+1768.25 °C / +3214.8 °F) and transitions to the vapor phase at a normal boiling point of 4,098 K (+3824.85 °C / +6916.7 °F), spanning a liquid thermodynamic range of 2056.60 K. In the CRV Science Dynamic Periodic Table, dragging the live temperature slider between absolute zero (0 K) and solar-photosphere temperatures (6,000 K) dynamically tracks Platinum's state transitions in real time alongside enthalpy and entropy phase equilibria.

Quantitative Atomic and Thermodynamic Parameter Matrix

Characteristic Oxidation States and Coordination Chemistry

As a d-block transition metal, partially filled (n−1)d orbitals lie close in energy to the outermost ns subshell, enabling variable oxidation states, d–d electronic transitions, coordination complex formation, and heterogeneous or metalloenzymatic redox catalysis. In chemical compounds, platinum exhibits characteristic oxidation states of +2, +4. Depending on the electronegativity difference (Δχ) of its bonding partners—such as Oxygen (χ = 3.44), Fluorine (χ = 3.98), Chlorine (χ = 3.16), Nitrogen (χ = 3.04), Carbon (χ = 2.55), or Hydrogen (χ = 2.20)—platinum forms redox-specific oxides, halides, hydrides, or coordination complexes governed by Gibbs free energy (ΔG = ΔH − TΔS).

Nucleosynthesis, Discovery History, and Elemental Origins

First identified or isolated in 1735, Platinum carries a distinct cosmological and geochemical signature. With atomic number Z = 78 beyond the iron-56 binding-energy peak, platinum is synthesized astrophysically via neutron-capture nucleosynthesis—combining slow neutron capture (the s-process in asymptotic giant branch stars) and rapid neutron capture (the r-process in neutron-star mergers and core-collapse supernovae).

Biochemical Classification: Abiotic / Technological / Synthetic

In comparative biochemistry and systems physiology, Platinum is classified as Abiotic / Technological / Synthetic. No known essential biological role; important in planetary geochemistry, astrophysics, materials science, or nuclear physics. Across terrestrial and marine ecosystems, its chemical speciation interacts with dna repair, thermodynamics, enthalpy, entropy, chemistry.

Key Mechanistic Functions and Technological Uses

Noble d-block catalyst used in PEM hydrogen fuel cells and catalytic converters. Square-planar cis-diamminedichloroplatinum(II) (cisplatin) cross-links adjacent purine bases in DNA to halt cancer cell replication. Researchers and students can further investigate Platinum's functional role alongside all 118 elements by launching the Interactive Periodic Table & Element Detective Lab on CRV Science Learn.

What is the electron configuration and valence shell structure of Platinum (Pt)?

Platinum (atomic number Z = 78) has the ground-state electron configuration [Xe] 4f¹⁴ 5d⁹ 6s¹, distributing its 78 electrons across 6 shells as 2 · 8 · 18 · 32 · 17 · 1. Its outermost shell contains 1 electrons, placing Platinum in Group 10, Period 6 (d-block) as a member of the Transition Metals. You can watch these 78 electrons orbit the nucleus in real time in the Dynamic Periodic Table Bohr Lab.

What phase of matter is Platinum at room temperature, and when does it melt or boil?

At standard room temperature (298 K / 25 °C) and 1 atm pressure, Platinum is a crystalline solid. It melts at 2,041.4 K (+1768.25 °C / +3214.8 °F) and boils at 4,098 K (+3824.85 °C / +6916.7 °F). Using the 0–6,000 K temperature slider in the Interactive Periodic Table, you can observe Platinum's exact solid, liquid, and gas transitions relative to all other elements.

How does Platinum function in biochemistry, materials science, and technology?

Noble d-block catalyst used in PEM hydrogen fuel cells and catalytic converters. Square-planar cis-diamminedichloroplatinum(II) (cisplatin) cross-links adjacent purine bases in DNA to halt cancer cell replication. In biological systems, it is categorized under Abiotic / Technological / Synthetic, with principal oxidation states of +2, +4 and a first ionization energy of 870 kJ/mol.