Answer:
Metals are on the <em>far left side</em> of the staircase, except for Aluminum, Germanium, <em>Stibium</em><em> </em>[<em>Antimony</em>], Polonium, and <em>Tennessine</em><em> </em>[<em>Ununseptium</em>], and non-metals are on the <em>far right side</em> of the staircase, except for Boron, Carbon, Silicon, Arsenic, Selenium, Tellurium, Astatine, and <em>Oganesson</em> [<em>Ununoctium</em>], The <em>Periodic Table of Elements</em> was created by the famous Russian inventor and chemist <em>Dmitri Mendeleev</em>.
* The boldfaced elements are what are known as metalloids.
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