Scandium's atomic number is 21 and it's mass is 44.9559. It belongs in period 4 and in group 3. The name of the group its in are Transition Metals. Scandium's state of matter is a solid and is a metal.
Aluminum-Scandium alloy in sports equipment.
Scandium's oxide is used to replicate sunlight.
The isotope 45Sc is used as a tracing agent in oil refineries.