its atomic number = number of (positively
charged) protons = 57
It corresponding arrangement or configuration of its (negatively charged) electrons = 2. 8. 18. 18. 9. 2
to the configuration, Lathanum should lie on the 6th row or period
of the table.
It lies in the lanthanide series.
Metal, silvery white
a rare earth metal
medicine (lanthanum carbonate), catalysts, additives in glass, hybrid and electric car batteries