No, there can't be other natural elements. The only elements we do not know about are the incredibly dense ones (more than about 120 protons) that can not in any way form naturally, as they are too unstable and fall apart nearly instantaneously when created in labs. There are theories about atoms being stable with something like 150 protons (I don't remember the exact number), but these can not form naturally, only in an artificial environment.
An element is an atom with a certain number of protons. If you change the number of protons, the atom acts just like a different element that has that number of protons. You can not get new elements with the same number of protons and different properties than an existing element.
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Maybe they would say "humbug", life can not possibly exist on an oxygen world, it's just unrealistic.
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Actually, no, they would not say that. They would have studied chemistry and seen that oxygen is reactive enough to be used to transmit excess energy and a Hydrogen atom when breaking apart glucose molecules to get energy for cells to funtion, but not so reactive that it eats away at everything. So if these chlorine world lifeforms existed, they would not dismiss life on an oxygen world as unrealistic. That is, if it were possible for them to exist in the first place.
I never said I knew everything. I do know some basic chemistry though.
[ February 16, 2003, 01:48: Message edited by: Imperator Fyron ]