NEPTUNIO

The neptunio is a synthetic element of the periodic table which symbol is Np and his atomic number is 93. It comes from the planet of the same name. The neptunio is a radioactive metal of the "rare" lands and has at least 3 allotropic forms. Quarter of the family of the actínidos or the second period of transition hospitalizes of the periodic system of the elements.
It was obtained by the first time in 1940 by McMillan and Abelson bombarding uranium with deuterones with great speed. The isotope 237 has been found, in very small quantities, in mines of uranium.
This information has been obtained of www.wikipedia.org and www.webelements.com