Answer:
In its stable molecular form, oxygen exists as two atoms and is written O2. to distinguish it from an atom of oxygen O, or ozone, a molecule of three oxygen atoms, O3. Even though each of these is all oxygen, combining atoms of the same element may give very different properties to the molecule.
Explanation:
The - article adj
Bill - SN
Must be paid - verb phrase
By - preposition
Whoever purchased the lumber - noun clause obj of the preposition
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