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I'll throw one out... Was thinking of of something where a scientist is discredited and has their work stolen, then seeks cold calculating revenge by murdering anyone associated with it using each element in succession, maybe with a periodic table element sample as a calling card.
Now hydrogen is easy, cylinder, leak, ignition!
Helium - inert gas asphyxiation
But how do you kill someone with Lithium, Beryllium etc?
And I mean quickly, not chronic, unless you could honestly say that something was "a death sentence".
Allowing compunds, as well as pure elements, would allow a few dodges, like drowning for Hydrogen or Oxygen.
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