An electron is transferred from one atom to another. Which type of bond is formed?

Covalent bonds result from the sharing of electrons between two atoms rather than the transfer of electrons. This type of bond typically occurs between nonmetals that have similar electronegativities, allowing them to share electron pairs to achieve stable electron configurations. Thus, a covalent bond does not apply to situations where electrons are transferred.

The term "elemental bond" is not a recognized classification in chemistry. Bonds are typically categorized as ionic, covalent, or metallic, based on how electrons are shared or transferred between atoms. Therefore, this choice does not accurately describe the bonding process involving electron transfer.

Metallic bonds involve the pooling of electrons among many metal atoms, creating a 'sea of electrons' that allows metals to conduct electricity and heat. This bonding type does not involve the transfer of electrons to form charged ions, which is a characteristic of ionic bonds. Hence, metallic bonds are not formed through electron transfer.