Actinium is the first member of the actinoids family.
Actinium is the first member of the actinoids family.Actinium is a solid, inner transition metal, radioactive, very rare.
After the IUPAC nomenclature lanthanum is a lanthanoid and actinium is an actinoid.
Actinium is the first member of the actinoids family.
Actinium (Ac) is a chemical element.Actinoids is the name of the radioactive elements family which contain actinium.
Lanthanum and lutetium are members of the lanthanoids family.Actinium and lawrencium are members of the actinoids family.
Actinium is a member of the actinoids family with the atomic number 89.
Lanthanum and lutetium: lantanides group Actinium and lawrentium: actinides group
Actinium is a radioactive natural chemical element, member of the family of actinides; actinium is a solid metal, very rare in the nature.
Actinuim is a member of the family of actinides.
Actinuim is a member of the family of actinides. Actinium is a solid metal, radioactive with the atomic number 89.
Actinium is a member of the actinides family; actinium is a natural chemical element, metal, solid, extremely radioactive.
actinium