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:
Answer:
She was proud of the speech once she finished it.
Explanation:
This is the correct form, though you need to be specific and describe who "them" is.