Sagot :
Answer:
D. oxygen
Explanation:
Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds.
Salt, Water and Alloy are Compounds which are composed of two or more elements.
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Answer:
D. Oxygen
Explanation:
Oxygen is an element because it only contains one element.