sex on the beach lol jk its 6
Promethium is placed in the period 6 of the periodic table, lanthanoids family.
Promethium belongs in the 7th family. The 7th family is The Lanthanide family.
The lanthanides, but it does not fit in as well
Promethium is one of the lanthanoids, atomic number 61, period 6.
Promethium is a metal in the family of lanthanoids.
Promethium is a member of the lanthanoids family.
Promethium is a member of the lanthanoids family.
niobium period
Promethium is a chemical element from the lanthanoids family, with the atomic number 61, metal, radioactive.
promethium
Seaborgium: group 6, period 7 - in the periodic table of Mendeleev.
Tin belongs to group 14, carbon family, period 5. Neon belongs to group 18, noble gases, period 2.