Element Scandium

Scandium ElementScandium atom is a rare earth metal atom, a scandium group element atom and a d-block element atom.
An element of the rare earth family of metals. It has the atomic symbol Sc, atomic number 21, and atomic weight 45.
The properties of scandium compounds are intermediate between those of aluminium and yttrium. A diagonal relationship exists between the behavior of magnesium and scandium, just as there is between beryllium and aluminium.
In the chemical compounds of the elements in group 3, the predominant oxidation state is +3.

Names and Identifiers

Chemical Formula:Sc
CAS:7440-20-2
Molecular Weight:44.956 g/mol
EC Number :231-129-2
MDL Number:MFCD00016323
Color:silvery white
Other Names:Skandium, Skandij, Scandio
PubChem CID:23952
IUPAC Name:Scandium
Inchl:InChI=1S/Sc
InChI Key:SIXSYDAISGFNSX-UHFFFAOYSA-N
Canonical SMILES:[Sc]
ICSC Number:n/a

Physical & Chemical Properties

Phase:Solid
Density:2.985  g/cm³
Boiling Point:3109 K ​(2836 °C, ​5136 °F)
Melting Point:1814 K ​(1541 °C, ​2806 °F)
Molecular Formula:Sc
Flash Point:n/a
Exact Mass:44.955910
Symbol:Globally Harmonized System of Classification
Signal Word:Danger
Hazard Statements:H228
Precautionary Statements:P210
Hazard Codes:F:Highlyflammable;
Risk Phrases:R11
Safety Phrases:S26-S28-S36/37-S7/9-S36/37/39-S16-S43-S45-S27
RIDADR:UN 3089 4.1/PG 2
WGK Germany:1
RTECS:n/a
Packaging Group:III
Hazard Class:8

In nature, scandium is found exclusively as the isotope 45Sc, which has a nuclear spin of 7/2; this is its only stable isotope.
Thirteen radioisotopes have been characterized with the most stable being 46Sc, which has a half-life of 83.8 days; 47Sc, 3.35 days; the positron emitter 44Sc, 4 h; and 48Sc, 43.7 hours.
All of the remaining radioactive isotopes have half-lives less than 4 hours, and the majority of these have half-lives less than 2 minutes. This element also has five nuclear isomers, with the most stable being 44mSc (t1/2 = 58.6 h).

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
45Sc44.9559100 (14)1007/24.756483

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
43Sc42.9611503.89 hEC to 43Ca7/24.62
44Sc43.9594043.93 hEC to 44Ca22.56
46Sc45.95517083.81 dβ to 46Ti43.03
47Sc46.9524083.349 dβ to 47Ti7/25.34
48Sc47.95223543.7 hβ to 48Ti6
49Sc48.95002457.3 mβ to 49Ti7/2
50Sc49.952191.71 mβ to 50Ti5

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