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Multiple Choice

In a Lewis dot diagram for boron, what does the three dots around the symbol indicate?

In Lewis dot diagrams, the dots around an element’s symbol represent valence electrons—the electrons in the outermost shell that participate in bonding. Boron has three valence electrons, so there are three dots surrounding its symbol. These dots are not protons (that’s the nucleus) and they don’t directly depict energy levels or bonds themselves; rather, they show how many electrons are available for bonding. The number of bonds boron tends to form is related to having three valence electrons, but the dots themselves simply indicate valence electrons.

In Lewis dot diagrams, the dots around an element’s symbol represent valence electrons—the electrons in the outermost shell that participate in bonding. Boron has three valence electrons, so there are three dots surrounding its symbol. These dots are not protons (that’s the nucleus) and they don’t directly depict energy levels or bonds themselves; rather, they show how many electrons are available for bonding. The number of bonds boron tends to form is related to having three valence electrons, but the dots themselves simply indicate valence electrons.