Position of niobium in the periodic table with other data about the element The scheme shows a the periodic table, and from left to right a cube representing the body-centered cubic structure of the metal followed by a simplified electron shell diagramm and a Niobium with 5 dots representig Valence electrons, the last two numbers followed by a letter are the number of Protons (41P) and the number of the neutrons (52N) in the only stable Niobium isotope. All info can be verified in the book <cite class="book" style="font-style:normal" id="Reference-Holleman-1985">Holleman, Arnold F.; Wiberg, Egon; Wiberg, Nils; (1985) "Niob" in  (in German)  <i> Lehrbuch der Anorganischen Chemie</i> (91–100 ed.), Walter de Gruyter, pp. 1,075–1,079  <small><a href="https://en.wikipedia.org/wiki/International_Standard_Book_Number" class="extiw" title="en:International Standard Book Number">ISBN</a>:  <a href="//commons.wikimedia.org/wiki/Special:BookSources/3110075113" title="Special:BookSources/3110075113">3110075113</a>. </small></cite> and at the page 147 for the  body-centered cubic structure.
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