Yttrium, is a chemical element that has the symbol Y and atomic number 39. A silvery metallic transition metal, yttrium is common in rare-earth minerals and two of its compounds are used to make the red color phosphors in cathode ray tube displays, such as those used for televisions.
Yttrium is a silver-metallic, lustrous rare earth metal that is relatively stable in air, strongly resembles scandium in appearance, and chemically resembles the lanthanides, and can appear to gain a slight pink lustre on exposure to light. Shavings or turnings of the metal can ignite in air when they exceed 400 °C. When yttrium is finely divided, it is very unstable in air. The metal has a low neutron cross-section for nuclear capture. The common oxidation state of yttrium is +3.
|Atomic number||39||Melting point /°C||1530|
|No. of naturally occurring isotopes||1||Boiling point /°C||3264|
|Metal radius(12-coordinate)/pm||180||ΔHf(monoatomic gas)/kJmol-1||425(+/-8)|
|Ionic radius(6-coordinate)/pm||90||Electrical resistivity|
|Ionization energy/kJmol-1 I||616||(20°C)/μohm cm||57-70|
|Ionization energy/kJmol-1 II||1181||Electronegativity χ||1.2|
|Ionization energy/kJmol-1 III||1980||E° (M3+(aq)\ + 3e- →M(s))/V||-2.372|
|Temperature (oC) @Vap. Pressure||Techniques||Remarks|
|10-8 Torr||10-6 Torr||10-4 Torr||Electron Beam||Crucible||Coil||Boat|
|830||973||1157||Excellent||Al2O3||Tungsten||Tungsten & Tantalum|| High Tantalum Solubility |
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