Initially I had Somnambula in place of Moondancer for mendelevium; the Moondancer idea was suggested by Melisareb. Mendeleev himself said that he conceived of the periodic table in a dream, so Moondancer is dreaming here (as befits her name somewhat) of the periodic table being turned into an Arkanoid/Breakout-like game.
Each of the 100 bricks – all the elements before mendelevium – is coloured according to the characters featured in the corresponding entry in the entire Periodic Ponies series, including the entries by joycall6. If the element was known to Mendeleev, and he correctly placed it in his 1870 periodic table, its symbol and rounded atomic weight are shown.