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An example of an elemental molecule is:

  1. Sodium Chloride

  2. Aluminum foil

  3. Oxygen

  4. Carbon dioxide

The correct answer is: Aluminum foil

Oxygen and Carbon dioxide are both compounds made of two or more different elements. Sodium Chloride is an ionic compound, meaning it is made of at least one metal and one non-metal. Aluminum foil is a pure metallic element, making it an example of an elemental molecule.