How many valence electrons does a single, neutral iodine atom have?

Name: How many valence electrons does a single, neutral iodine atom have?
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Question

Quizplus · Accepted Answer

Iodine has 7 valence electrons. This can be seen by looking at its electron configuration in the periodic table (1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6). The valence electrons are the ones in the outermost energy level, which in this case is the 5th shell. The 5th shell contains 7 electrons, making the answer D.

How Many Valence Electrons Does a Single, Neutral Iodine Atom