Question

Which phrase describes a valence electron?
A. an electron that has been removed from an atom
B. Any negatively charged particle in an atom
C. an electron in the innermost orbit of an atom
D.an electron in the outer energy level of an atom

Answer 1

The phrase that describes a valence electron is:

**D. an electron in the outer energy level of an atom**.

Valence electrons are important because they are involved in chemical bonding and determine the reactivity of an atom.