I have the same question too!!!Dang I thought I would get a answer I just guessed
D. They all contain carbon as an important part of their structure.
Answer:
An atom is a particle of matter that uniquely defines achemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons. ... The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons. A proton is positively charged.
Explanation:
oxidation of Nitrogen in NO2 is +4
