Final answer:
The chemical property is flammability and the most plentiful element in the universe that burns in air is hydrogen.
Step-by-step explanation:
The chemical property being described is flammability. Flammability is the ability of a substance to burn or ignite when exposed to fire or heat.
One example of an element that is highly flammable is hydrogen. It is the most plentiful element in the universe and burns in air, producing water as a byproduct.
Another example is oxygen, which supports the combustion of other substances. It allows materials to burn more readily by providing the necessary oxygen for the combustion process.
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