101, Mendelevium  
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Mendeleev once said that he conceived of the periodic table in a dream, so Moondancer dreams here (thanks to Melisareb for the idea; I initially had Somnambula because mendelevium was the first element synthesised one atom at a time, hence “hoping” for events).
 
Every one of the 100 previous entries in joycall6’s periodic table is referenced here as an Arkanoid/Breakout brick. The colours match the corresponding characters, but the symbol and atomic number are only printed if Mendeleev knew about the element and placed it correctly in his 1870 periodic table.
 

 
SVG here.