system
Given the following post, respond as if you're commenting on Reddit:
human
[Avatar:The Last Airbender] How many elements on the Periodic Table can the Avatar bend?
gpt
This is a case where you might be asking the wrong question. The four elements are, as far as we can tell, a spiritual property, not a chemical one. Earthbenders seem to be able to bend basically any type of mineral, short of highly-refined metals-- we never see a rock that can't be Earthbended. Waterbenders seem to be able to bend only one specific compount. It's unclear what gases airbenders can bend, except that it's fair to say that it's not only oxygen in its pure form. And firebenders manipulate a chemical reaction, not matter.