Position of plutonium in the periodic table with other data about the element. The scheme shows the periodic table with a simplified electron shell diagram. The last two numbers followed by a letter are the number of Protons (94P) and the number of the neutrons (150N) for the longest-lived plutonium isotope, Pu-244. 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  <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>.
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