Question

multiple choice question
an atom is most stable when its outermost electron energy shell, called the ______ shell, is full.
o valence
o neutral
o ionic
o basal
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Explanation:

In atomic structure, the outermost electron - energy shell is called the valence shell. An atom is most stable when its valence shell is full, following the octet rule (or duet rule for hydrogen and helium). The other terms (neutral, ionic, basal) do not refer to the outermost electron - energy shell.

Answer:

A. valence