Evil Scientist Bath

The hall is huge - easily a mile wide, and twice as long. Far above, in the vaulted ceiling, bats roost, their pitiful shrieks and cries adding to the macabre atmosphere. In the very centre lies a huge granite-lined pit, surrounded by approximately 118 taps. With a creak of rusty bolts, the door at the far end opens. Through it emerge two figures - one is the professor - tall and thin, with masses of white hair, the other is his servant, Igor.
"My armour, Igor", croaks the professor, "Quickly!" The hunched figure approaches dragging a huge, lead-lined radiation-proof suit of armour, which the professor quickly changes into. Once dressed, he begins to walk, hydraulics hissing and groaning with the movement. After what seems like millenia he reaches the bath, lying back on its granite bottom with a sigh.
"The taps, Igor."
"Which oneth tonight, masthur?" Igor casts his eyes over them, each one marked with a number and a chemical symbol.
"Something dramatic, I think... Bromine first." Igor turns the tap marked Br, and hundreds of litres of stinking brown liquid thunder into the tub. "Now, the chlorine..." Another tap, this time marked Cl is turned, this time gallons of liquid chlorine rushes out. "Ha ha... hahahahaaaaa..... ohhh, this is fun! I think we need to finish with a bang, though. Francium, Igor." Apprehensively, Igor approaches the tap marked Fr.
"Ith thith withe, masthur?"
"Now, Igor!" Igor turns the tap, quickly blocking his ears as a series of deafening bangs issue from the bath. Through the smoke and flames he can still hear the professor....
"Mwahahahahahahahaha... hahahahaha.... haaaaaaaa!"