Answer:
Oxygen
Explanation:
Oxygen has 6 valence electrons and it wants to have 8 to obtain a stable octet. So Oxygen gains two electrons in the bond, developing an anion.
It is also a non-metal, and they tend to gain anions.
Answer:
It is getting thicker and keeping the Earth warmer.
Answer:
<em>it is a chemical change as there is a change in color</em>
Explanation: