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Single mineral pb pb dating

Lanthanum (La, Z=57) Lanthanum is a soft, silvery-white, malleable, ductile, relatively reactive metal.

Its name comes from the Greek word aktinos, meaning "ray." It is found only in trace amounts in the Earth's crust, and is one of the 10 least abundant elements.

It is produced in the decay sequences of radioactive uranium-235.

In most periodic tables, lanthanum and actinium are considered to be a part of Group 3B, but in others lanthanum and actinium are considered part of the inner transition elements, leaving lutetium and lawrencium in Group 3B instead.

Most of these elements form 3 charges, although other oxidation states are known.

The transition elements or transition metals occupy the short columns in the center of the periodic table, between Group 2A and Group 3A.

They are sometimes called the d-block elements, since in this region the d-orbitals are being filled in, and are also referred to as B-group elements since in most numbering systems of the columns on the periodic table the numerals of these groups are followed by the letter B.

Scandium (Sc, Z=21) Scandium is a soft, silvery metal.