How many valence electrons does copper have?

• A. Two
• B. One
• C. Four
• D. Three

Answer: (B)

Copper has one valence electron, which is significant in understanding its chemical behavior. In the periodic table, copper is located in Group 11, which means it has an electron configuration of [Ar] 3d10 4s1. The most outer shell where the valence electrons are located is the 4s orbital, and since there is only one electron present in that shell, copper is classified as having one valence electron.

This one valence electron plays a crucial role in copper's ability to conduct electricity and form bonds, especially in its common oxidation states of +1 and +2. These characteristics make copper a valuable metal in various electrical and electronic applications.