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Element 39 - Yttrium (Y) sound

From teh town of Ytterby, Sweden, where it was discovered in 1794; a scaly metal with an iron-grey sheen. Yttrium 90, a radioactive isotope, has a dramatic medical use in needles which have replaced the surgeon's knife in killing pain-transmitting nerves in the spinal cord.

Properties

Atomic Number: 39
Atomic Weight: 88.9059
Electron Configuration (at ground state): 1s22s22p63s23p63d104s24p64d15s2
Oxidation States (Bold most stable):
Boiling Point (K): 3611
Melting Point (K): 1795
Density (at 300K -- g/cm3): 4.47
Atomic Volume (at 300K -- cm3/mol) 19.80
Number of stable isotopes: 1
Mass Number (Bold naturally occurring) -- Half-Life -- Disintigration Type: 88 -- 106.6 days -- positron emission, orbital electron capture
Covalent Radius (Å): 1.42
Atomic Radius (Å): 1.78
First Ionization Potential (V): 6.38
Electronegativity (Pauling's): 1.22
Specific Heat Capacity (at 300K -- J g-1 K-1): 0.30
Heat of Vaporization (kJ/mol): 393.3
Heat of Fusion (kJ/mol): 17.15
Electrical Conductivity (at 293K for polycrystalline material -- 106 (ohms)-1 cm-1): 1.8
Thermal Conductivity (at 300K -- W m-1 K-1): 17.2
Crystal Structure: Hexagonal
Acid-Base Properties: Slightly basic