Chemistry CFE Practice Test

Valence electrons are electrons located in which region?

Core electrons Neutrons Outermost energy level Nuclear shell

Correct Answer:

Outermost energy level

Explanation:

Valence electrons are the electrons in the outermost energy level of an atom. They sit farthest from the nucleus and are the ones most readily involved in bonding, so they largely determine an element’s chemical properties. Inner, or core, electrons stay closer to the nucleus and don’t participate in bonding to the same extent. Neutrons are not electrons at all; they reside in the nucleus and don’t affect chemical bonding. The outermost energy level, or highest principal quantum number shell, is where these valence electrons live, and that’s why this region is key to reactivity. For example, sodium has one valence electron in its outer shell, while chlorine has seven, which helps explain their tendency to form NaCl.

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