Which of these elements are you least likely to find in nature as a pure element (that is, not combined with any other elements in a compound)? Use the periodic table to answer the question.

Sodium is highly reactive, so it readily bonds with other elements and is usually found in compounds rather than as pure sodium in nature. Gold can occur as a pure element, while oxygen and argon can also be found uncombined, so sodium is least likely to occur in pure form.

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