Nuclides
About the app ↗
Chemical element · Atomic number 39
Yttrium (Y)
Transition metals · Period 5 · Solid
Element identity
- Atomic number (Z)
- 39
- Symbol
- Y
- Atomic weight / isotope mass number
- 88.905 838(2)
- Category
- Transition metals
- Physical state (reference)
- Solid
- Period
- 5
- Group (reference)
- 3
- Block
- d
Physical properties
- Appearance
- Silvery white
- Density
- 4.472 g·cm⁻³
- Melting point
- 1799 K / 1526 °C / 2779 °F
- Boiling point
- 3203 K / 2930 °C / 5306 °F
- Sublimation point
- Not available
Atomic and material properties
- Electron configuration
- [Kr] 4d¹ 5s²
- Electrons per shell
- K2 L8 M18 N9 O2
- Oxidation states
- 3, 2, 1
- Electronegativity (Pauling)
- 1.22
- Atomic radius
- 212 pm
- Covalent radius
- 190±7 pm
- Molar ionization energies
- 1st: 600 kJ·mol⁻¹ 2nd: 1180 kJ·mol⁻¹ 3rd: 1980 kJ·mol⁻¹ 4th: 5847 kJ·mol⁻¹ 5th: 7430 kJ·mol⁻¹ 6th: 8970 kJ·mol⁻¹ 7th: 11,190 kJ·mol⁻¹ 8th: 12,450 kJ·mol⁻¹ 9th: 14,110 kJ·mol⁻¹ 10th: 18,400 kJ·mol⁻¹ 11th: 19,900 kJ·mol⁻¹ 12th: 36,090 kJ·mol⁻¹
- Thermal conductivity
- 17.2 W·m⁻¹·K⁻¹
- Molar heat capacity
- 26.53 J·mol⁻¹·K⁻¹
- Crystal structure
- Hexagonal close packed
- CAS number
- 7440-65-5
Property source: Wikipedia — Yttrium, adapted from the Nuclides App snapshot. Quoted conditions and qualifiers are retained.
Sources and interpretation
Snapshot exported 24 October 2026 from the element assets used by Nuclides. Properties are a reference compilation, not a new evaluation. Missing values are shown as “Not available”. Density and phase depend on temperature, pressure and allotrope; retained conditions are part of the quoted property.
Atomic weight is dimensionless. Parentheses give uncertainty in the last quoted digits. A single integer in square brackets is an isotope mass number, not a standard atomic weight. The snapshot can differ from current evaluations; consult CIAAW standard atomic weights and the IUPAC periodic table for current values and conventions.
Element properties in the App snapshot are adapted from Wikipedia. Each element page links to its source article; text adaptations are available under CC BY-SA 4.0. No third-party images are included.
Go from elements to nuclear data
Keep Nuclides on your phone.
Explore connected element and nuclide references, decay chains and calculators in the app. See each store for pricing and in-app purchases.
