Don't mean to be picky, but that textbook must be Lithium ink on Beryllium paper 😂

https://xkcd.com/2723

(!Image Description in link: A minimal periodic table is listed comprising only of H, He, Li and Be. The figure is labelled "Figure 6.14: The periodic table of elements", and the comic is subtitled: "You can spot an outdated science textbook by checking the bottom of the periodic table for missing elements. For example, mine waas published half an hour after the Big Bang.")