Answer:
i think the last one but not so sure
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:
I did this question a few weeks back but all i can remember is that im pretty sure i chose C and it was incorrect
Could you clarify the question
A sequence of similar objects or events sufficiently close in time or space to be perceived as a group