which is an example of a covalent compound?

Question

a.some electrons in carbon dioxide function as valence electrons in both carbon and oxygen.
b.ions in a bar iron are surrounded by a large number of valence electrons.
c.silver ions are surrounded by a sea of valence electrons.
d.calcium gives an electron to chlorine to form a stable bond.

Answer 1

I am not impressed with any of the choices but a seems to be the best. By the way, you will get more help and faster help if you tell what you don't understand about your question. Just posting a question and expecting us to answer each and every one is not the way we like to help. This one is a freebie for you but we can help you better if you show something of your thoughts.