Scandium

Atomic properties
Atomic number	21
Standard atomic weight	44.955 912(6)
Electron configuration	[Ar] 3d1 4s2
Physical properties
Melting point	1539 °C (1812 K)
Boiling point	2748 °C (3021 K)
Density	3.0 g cm−3 (20 °C)
Chemical properties
Electronegativity	1.36 (Pauling)
Solubility in water	reacts
Ionization energy
	6.561 44(6) eV; 633.083(6) kJ mol−1
Electron affinity
	0.189(20) eV; 18.2(19) kJ mol−1
Atomic radii
Covalent radius	170 pm
Ionic radius	88.5 pm (Sc3+, Oh)
Thermodynamic properties
Standard entropy	34.6 J K−1 mol−1
Miscellaneous
CAS number	7440-20-2
	Where appropriate, and unless otherwise stated, data are given for 100 kPa (1 bar) and 298.15 K (25 °C).
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calcium ← scandium → titanium

—
↑
Sc
↓
Y

Scandium (symbol: Sc) is a chemical element, the lightest of the transition metals.

Notes and references

↑ ^1.0 ^1.1 Greenwood, Norman N.; Earnshaw, A. Chemistry of the Elements; Pergamon: Oxford, 1984; pp 1102–10. ISBN 0-08-022057-6.
↑ Allred, A. L. Electronegativity values from thermochemical data. J. Inorg. Nucl. Chem. 1961, 17 (3–4), 215–21. DOI: 10.1016/0022-1902(61)80142-5.
↑ ^3.0 ^3.1 Scandium. In NIST Chemistry WebBook; National Institute for Standards and Technology, <http://webbook.nist.gov/cgi/inchi/InChI%3D1S/Sc>. (accessed 26 December 2010).
↑ Moore, Charlotte E. Ionization potentials and ionization limits derived from the analyses of optical spectra. Natl. Stand. Ref. Data Ser., (U.S. Natl. Bur. Stand.) 1970, 34, 1–22, <http://www.nist.gov/data/nsrds/NSRDS-NBS34.pdf>.
↑ Cordero, Beatriz; Gómez, Verónica; Platero-Prats, Ana E.; Revés, Marc; Echeverría, Jorge; Cremades, Eduard; Barragán, Flavia; Alvarez, Santiago Covalent radii revisited. Dalton Trans. 2008 (5), 2832–38. DOI: 10.1039/b801115j.
↑ Shannon, R. D. Revised effective ionic radii and systematic studies of interatomic distances in halids and chalcogenides. Acta Crystallogr. A 1976, 32 (5), 751–67. DOI: 10.1107/S0567739476001551.
↑ Jolly, William L. Modern Inorganic Chemistry, 2nd ed.; McGraw-Hill: New York, 1991; p 589. ISBN 0-07-032768-8.

See also the corresponding article on Wikipedia.

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