I’m not sure – probably some of the more exotic, highly radioactive ones, like plutonium. Radioactivity can kill you, because the radiation can penetrate through your skin, affecting your cells, leading to radiation sickness and death.
Hydrogen can also be pretty dangerous – it is highly flammable, so if a large amount leaks it can create an explosion. Are you familiar with Hindenburg? A huge zeppelin (airship) that exploded in the 1930s. It was filled with hydrogen, and it leaked and exploded spectacularly. These days, airships are filled with helium, which doesn’t explode.
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