which is an example of a covalent compound?
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.
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.
The correct example of a covalent compound is option A. In carbon dioxide, some electrons function as valence electrons in both carbon and oxygen. Covalent compounds are formed when atoms share electrons rather than transferring them.
The correct example of a covalent compound is option A: some electrons in carbon dioxide function as valence electrons in both carbon and oxygen.
To determine the answer, we need to understand what a covalent compound is. A covalent compound is formed when two or more nonmetal atoms share electrons to achieve a stable electron configuration. In covalent bonds, electrons are shared between atoms rather than being transferred from one atom to another.
Option A describes carbon dioxide (CO2), where the carbon and oxygen atoms share electrons. Carbon, with 4 valence electrons, shares two of its electrons with each of the two oxygen atoms, which also need two electrons to fill their valence shell. This sharing of electrons allows both carbon and oxygen to achieve a stable electron configuration, making carbon dioxide a covalent compound.
Option B describes metallic bonding, not covalent bonding. In metallic bonds, the valence electrons are delocalized and shared among all the atoms. This is typical for metals like iron (Fe) in the form of a solid bar.
Option C describes metallic bonding as well. Silver ions are positively charged and are surrounded by a sea of valence electrons, which are shared among all the silver atoms. This gives metals their characteristic properties, such as electrical conductivity.
Option D describes ionic bonding, not covalent bonding. Ionic compounds are formed when one or more electrons are transferred from one atom to another, resulting in the formation of positive and negative ions. In this case, calcium gives an electron to chlorine to form a stable bond, creating an ionic compound.
Therefore, based on the definitions and explanations provided, the correct example of a covalent compound is option A.