Where are the reactive electrons of an atom typically located?

• A. In the outermost electron shell (valence shell)
• B. In the innermost electron shell
• C. In the neutron cloud
• D. In the nucleus

Answer: (A)

Verified step by step guidance

1. Understand that electrons in an atom are arranged in shells or energy levels around the nucleus.
2. Recognize that the outermost electron shell is called the valence shell, which contains the valence electrons.
3. Know that valence electrons are the ones involved in chemical reactions because they can be gained, lost, or shared with other atoms.
4. Recall that electrons in inner shells are more tightly bound and generally not involved in chemical bonding.
5. Conclude that the reactive electrons of an atom are typically located in the outermost electron shell (valence shell).